external: fix client healhchecker user keyring return

if the client.health checker already exited it was
returning extra information, It was making the structure and
return JSON non idempotent output, So fixed
that problem by returning a single value

Signed-off-by: parth-gr <paarora@redhat.com>

deploy/examples/create-external-cluster-resources.py

@@ -1162,7 +1162,7 @@ class RadosJSON:
         # check if user already exist
         user_key = self.check_user_exist(entity)
         if user_key != "":
-            return user_key, f"{entity.split('.', 1)[1]}"
+            return user_key
 
         ret_val, json_out, err_msg = self._common_cmd_json_gen(cmd_json)
         # if there is an unsuccessful attempt,