CA-401274: Remove external auth limitation during set_hostname_live

Now we got winbind as the Active Direcotry backend, the joined
netbios name is persisted in smb.conf, thus can be compatible with
hostname change

This commit just remove the set_hostname_live limitation

Signed-off-by: Lin Liu <[email protected]>

Author: liulinC

ocaml/xapi/xapi_host.ml

@@ -1337,21 +1337,6 @@ let serialize_host_enable_disable_extauth = Mutex.create ()
 
 let set_hostname_live ~__context ~host ~hostname =
   with_lock serialize_host_enable_disable_extauth (fun () ->
-      let current_auth_type =
-        Db.Host.get_external_auth_type ~__context ~self:host
-      in
-      (* the AD extauth plugin is incompatible with a hostname change *)
-      ( if current_auth_type = Xapi_globs.auth_type_AD then
-          let current_service_name =
-            Db.Host.get_external_auth_service_name ~__context ~self:host
-          in
-          raise
-            (Api_errors.Server_error
-               ( Api_errors.auth_already_enabled
-               , [current_auth_type; current_service_name]
-               )
-            )
-      ) ;
       (* hostname is valid if contains only alpha, decimals, and hyphen
          	 (for hyphens, only in middle position) *)
       let is_invalid_hostname hostname =