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: I2a5c022417a8b67e85090865ddef0979813591b1

stackforge/shaker,openstack/shaker,stackforge/shaker,openstack/shaker,openstack/shaker