Updated openstack/openstack
Project: openstack/nova  ffe6bb5507afd22e2e3a54885a2ca708f9f3eb68
null
baremetal: volume driver refactoring and tests

Refactor the LibVirtVolumeDriver to test each step of
attaching and detaching a volume. And add tests.

Closes-Bug: 1240470
Change-Id: I51906bec6ba5d6af71997df277bb368cff81b3b3