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: If621271421faeb5a19bba09534a6770bbfdccc5f
Partial-bug: #1280522

stackforge/ooi,openstack/ooi