Updated openstack/openstack
Project: openstack/cinder  4aa11e93801082ac7a836991c046d431b8376605

Fixes wrong usage of mock.assert_not_called()

There is no method assert_not_called in mock, use
assertFalse(mock.called) instead of that.

Change-Id: I1b37c49e0a624de42d89890b44458ec6bd4239ee