Updated openstack/openstack
Project: openstack/cinder  157d50aeaf4b4227eee5825f05f134bc7a5ef72a
null
VMware: changing volumeops tests from mox to mock.

Changing unit tests implementation of volumeops to mock. In the process
also moving all these unit tests into a separate class for better
test organization.

Partial-Bug: #1261097
Change-Id: I08b2341b22ed9c8f63930a2c73a9737cbe7ef540