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: Ida4c8a8159b2ebc2826646052f5ca4dbc8229575

openstack/mistral,StackStorm/mistral,StackStorm/mistral,openstack/mistral