Fix buggy tests that use REQUIRES_LOCKING=True

[Davanum Srinivas (DIMS)]

from https://github.com/openstack/nova/blob/master/nova/test.py#L311

        # NOTE(sdague): because of the way we were using the lock
        # wrapper we eneded up with a lot of tests that started
        # relying on global external locking being set up for them. We
        # consider all of these to be *bugs*. Tests should not require
        # global external locking, or if they do, they should
        # explicitly set it up themselves.
        #
        # The following REQUIRES_LOCKING class parameter is provided
        # as a bridge to get us there. No new tests should be added
        # that require it, and existing classes and tests should be
        # fixed to not need it.

We need to fix the tests that use REQUIRES_LOCKING = True.

[Sean Dague (sdague)]

A bug for this isn't really helping get this work done. This is just one of those non bug test cleanup efforts.