Updated openstack/openstack
Project: openstack/keystone  5a93bd50d5461757bef693ea29430b622be24ece
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Uses fixtures for mox and stubs

Fixtures use the much more reliable addCleanup instead of the tearDown.
They also allow us the only use fixtures in test classes that use then
instead of having the overhead for every test class.

Change-Id: Ifca4ecce0d66932282334d3e4db6d10a2921dbbb