fix linter and python tests

Author: nammn

docker/mongodb-kubernetes-tests/kubetester/mongotester.py

@@ -87,8 +87,8 @@ def _wait_for_mongodbuser_reconciliation() -> None:
     try:
         # Import inside function to avoid circular imports
         import kubernetes.client as client
-        from tests.conftest import get_central_cluster_client
         from kubetester.mongodb_user import MongoDBUser
+        from tests.conftest import get_central_cluster_client
 
         namespace = KubernetesTester.get_namespace()
         api_client = client.CustomObjectsApi(api_client=get_central_cluster_client())