Passing endpoint makes authenticate lazy so getting catalog fails.

Change-Id: Id37c06000d51e2e03a4fde02016097a847b64061
diff --git a/tempest/manager.py b/tempest/manager.py
index bab7ea7..21fa648 100644
--- a/tempest/manager.py
+++ b/tempest/manager.py
@@ -157,7 +157,7 @@
         return keystoneclient.v2_0.client.Client(username=username,
                                                  password=password,
                                                  tenant_name=tenant_name,
-                                                 endpoint=auth_url)
+                                                 auth_url=auth_url)
 
     def _get_network_client(self):
         # TODO(mnewby) add network-specific auth configuration