Using assertIsNotNone() instead of assertNotEqual(None)
Using assertIsNotNone() instead of assertNotEqual(None)

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

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

Change-Id: I5a532f8b2e0241f429a3e7a22f92085ce428c009

ramineni/my_congress,openstack/congress,ramineni/my_congress,openstack/congress,ramineni/my_congress,ramineni/my_congress