noop pglock for unit tests

awx/main/utils/pglock.py

@@ -0,0 +1,15 @@
+# Copyright (c) 2017 Ansible by Red Hat
+# All Rights Reserved.
+
+from contextlib import contextmanager
+
+from django_pglocks import advisory_lock as django_pglocks_advisory_lock
+from django.db import connection
+
+@contextmanager
+def advisory_lock(*args, **kwargs):
+    if connection.vendor == 'postgresql':
+        with django_pglocks_advisory_lock(*args, **kwargs) as internal_lock:
+            yield internal_lock
+    else:
+        yield True