Updated openstack/openstack
Project: openstack/oslo.config  47b49e8b6bc0775205005150fbbe0854d0d41980
null
Utilizes assertIsNone and assertIsNotNone

Using assertEqual/assertNotEqual to test if an element
is or is not None is too python2.4.
Our unit testing framework supports assertIsNone and assertIsNotNone
which were created for these types of tests.

Change-Id: I969ee943e31b4fa0291f6cb9e21e2f654e88e66e