Updated openstack/openstack
Project: openstack/horizon  821619fff324ba1bc3f697f585a0c350573f24a2

Replace UserManager with None in tests

Don't access keystoneclient's UserManager in tests. This should be
considered private data of keystoneclient and is not actually used by
horizon tests.

Change-Id: I261e79b31dfc7388adb3dc63a3a5e54042f05e54
Closes-Bug: #1347236