[irods#8017] Modify schema file to enforce required attributes

The server expects these already, so the schema file is updated accordingly.
- controlled_user_connection_list.control_type
- controlled_user_connection_list.users

schemas/configuration/v4/server_config.json.in

@@ -66,7 +66,8 @@
                     "items": {"type": "string"},
                     "uniqueItems": true
                 }
-            }
+            },
+            "required": ["control_type", "users"]
         },
         "maximum_connections": {
             "type": "integer",