validation(database/postgres) add SSL client authentication (PROJQUAY-2417)

[michaelalang]

Issue: https://issues.redhat.com/browse/PROJQUAY-2417
Pull-request title must start with "PROJQUAY-2417 - "

Changelog:
Added SSL client authentication by extending libpg connection parameter support as well as network parameters

Docs:

Testing:
since this change requires a Postgres Database with SSL client authentication setup, I executed the validation run manually after building the image as described in the README.md
I did not setup Redis for the test as I have verified that Quay will be able to use SSL client authentication if validation is turned off to get it started.

Details:

/go/src/config-tool # export DEBUGLOG=true
/go/src/config-tool # config-tool validate -c /conf/stack -m online 
DEBU[0000] Validating AccessSettings                    
DEBU[0000] Validating ActionLogArchiving                
DEBU[0000] Validating AppTokenAuthentication            
DEBU[0000] Validating BitbucketBuildTrigger             
DEBU[0000] Validating BuildManager                      
DEBU[0000] Validating Database                          
DEBU[0000] Scheme: postgresql                           
DEBU[0000] Host: cluster-rw.quay.svc:15432      
DEBU[0000] Db: quay                                     
DEBU[0000] Params: sslcert=%2F.postgresql%2Fpostgresql.crt&sslkey=%2F.postgresql%2Fpostgresql.key&sslmode=verify-full&sslrootcert=%2F.postgresql%2Froot.crt 
DEBU[0000] Including params sslcert=%2F.postgresql%2Fpostgresql.crt&sslkey=%2F.postgresql%2Fpostgresql.key&sslmode=verify-full&sslmode=verify-full&sslrootcert=%2F.postgresql%2Froot.crt&sslrootcert=%2F.postgresql%2Froot.crt 
DEBU[0000] Pinging database at postgresql://quay@cluster-rw.quay.svc:15432/quay?sslcert=%2F.postgresql%2Fpostgresql.crt&sslkey=%2F.postgresql%2Fpostgresql.key&sslmode=verify-full&sslmode=verify-full&sslrootcert=%2F.postgresql%2Froot.crt&sslrootcert=%2F.postgresql%2Froot.crt 
plpgsql
pg_stat_statements
pg_trgm
DEBU[0000] Validating DistributedStorage                
DEBU[0000] Validating ElasticSearch                     
DEBU[0000] Validating Email                             
DEBU[0000] Validating GitHubBuildTrigger                
DEBU[0000] Validating GitHubLogin                       
DEBU[0000] Validating GitLabBuildTrigger                
DEBU[0000] Validating GoogleLogin                       
DEBU[0000] Validating HostSettings                      
DEBU[0000] Validating JWTAuthentication                 
DEBU[0000] Validating LDAP                              
DEBU[0000] Validating OIDC                              
DEBU[0001] Validating QuayDocumentation                 
DEBU[0001] Validating Redis                             
DEBU[0001] Address: redis:6379                          
DEBU[0001] Username:                                    
DEBU[0001] Password Len: 8                              
DEBU[0001] Ssl: <nil>                                   
DEBU[0001] Address: redis:6379                          
DEBU[0001] Username:                                    
DEBU[0001] Password Len: 8                              
DEBU[0001] Ssl: <nil>                                   
DEBU[0001] Redis%!(EXTRA string=Could not connect to Redis with values provided in BUILDLOGS_REDIS. Error: dial tcp: lookup redis on 10.0.2.3:53: no such host, []string=[BUILDLOGS_REDIS]) 
DEBU[0001] Redis%!(EXTRA string=Could not connect to Redis with values provided in USER_EVENTS_REDIS. Error: dial tcp: lookup redis on 10.0.2.3:53: no such host, []string=[USER_EVENTS_REDIS]) 
DEBU[0001] Validating RepoMirror                        
DEBU[0001] Validating SecurityScanner                   
DEBU[0001] Validating TeamSyncing                       
DEBU[0001] Validating TimeMachine                       
DEBU[0001] Validating UserVisibleSettings               
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
|      Field Group       |                                                              Error                                                               | Status |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| AccessSettings         | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| ActionLogArchiving     | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| AppTokenAuthentication | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| BitbucketBuildTrigger  | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| BuildManager           | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| Database               | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| DistributedStorage     | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| ElasticSearch          | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| Email                  | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| GitHubBuildTrigger     | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| GitHubLogin            | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| GitLabBuildTrigger     | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| GoogleLogin            | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| HostSettings           | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| JWTAuthentication      | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| LDAP                   | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| OIDC                   | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| QuayDocumentation      | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| Redis                  | Could not connect to Redis with values provided in BUILDLOGS_REDIS. Error: dial tcp: lookup redis on 10.0.2.3:53: no such host   | 🔴     |
+                        +----------------------------------------------------------------------------------------------------------------------------------+--------+
|                        | Could not connect to Redis with values provided in USER_EVENTS_REDIS. Error: dial tcp: lookup redis on 10.0.2.3:53: no such host | 🔴     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| RepoMirror             | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| SecurityScanner        | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| TeamSyncing            | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| TimeMachine            | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+
| UserVisibleSettings    | -                                                                                                                                | 🟢     |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------+--------+

[michaelalang]

@BillDett can someone from the Team verify and approve the PR please ?
thanks
Michi