Replace assertEqual(None, *) with assertIsNone in tests
Replace assertEqual(None, *) with assertIsNone in tests

Replace assertEqual(None, *) with assertIsNone in tests to have
more clear messages in case of failure.

Change-Id: Icba7c9d4664bd644544cce15ad2fba45b1281d38
Closes-bug: #1280522

openstack/zaqar,openstack/zaqar,openstack/zaqar,openstack/zaqar