Remove the last of the nose-isms.
Remove the last of the nose-isms.

testtools provides a skipTest method, so there's no need to pull in nose
directly into the tests.

Part of blueprint grizzly/testtools.

Change-Id: I97a9f09a27cad0433949a96fc18001ecf69c8ba2

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator