Updated openstack/openstack
Project: openstack/nova  008f5b67839ae03fa9a73ddc9a430c8312472e1a

libvirt: convert driver test suite to avoid DB usage

The LibvirtDriverTestCase uses the database for creating
instances and accessing flavors, which can easily be mocked
in the tests. This allows it to be converted to NoDBTestCase
which improves perf from 4.6s to 0.8s

Partial-bug: #1369516
Change-Id: I45e9ae6af3d5c83b54ad1287f2fba44dee30338f