Updated openstack/openstack
Project: openstack/nova  c170db44e5ec6f2607d7f59c342b358689479ad4

libvirt: make method signatures match parent class

Fix any inconsistencies in method signatures between the
libvirt driver impl and the ComputeDriver parent class.
Add a test case to prevent future regressions.

Partial-bug: #1333219
Change-Id: I221433273bd73bb84ed62c8579d45471ac65e1ef