Using assertIsNone() instead of assertEqual(None, ...)
Using assertIsNone() instead of assertEqual(None, ...)

Following OpenStack Style Guidelines[1]:
[H203] Unit test assertions tend to give better messages for more
specific assertions. As a result, assertIsNone(...) is preferred
over assertEqual(None, ...) and assertIs(None, ...)

[1] http://docs.openstack.org/developer/hacking/#unit-tests-and-assertraises

Change-Id: I4ce1745a90b043ea342fb157683b01f862c1bc3d

stackforge/python-openstacksdk,dtroyer/python-openstacksdk,openstack/python-openstacksdk,stackforge/python-openstacksdk,dtroyer/os-client-config,dtroyer/python-openstacksdk,openstack/os-client-config,openstack/python-openstacksdk