Updated openstack/openstack
Project: openstack/nova  110addf6ba36399992d6fb8ab7460bc05fdd12d9

Fix integrated test cases for assisted-volume-snapshots

qcow is not a valid type of snapshot in real environment,
the require type should be qcow2 instead of qcow.
Change-Id: I0fc8e90913699074cd997f5c1e0693372436d14f