Cap the default etcd backend quota at 8 GiB

Author: Vonng

roles/etcd/templates/etcd.conf

@@ -26,8 +26,8 @@ election-timeout: {{ etcd_election_timeout|default(1000) }}
 
 heartbeat-interval: {{ etcd_heartbeat_interval|default(100) }}
 
-# increase default quota from 2 GiB to 16 GiB
-quota-backend-bytes: 17179869184
+# increase default quota from 2 GiB to 8 GiB
+quota-backend-bytes: 8589934592
 
 # important: enable auto compaction
 auto-compaction-mode: periodic