Updated openstack/openstack
Project: openstack/tempest  a43830306a76358af2f9425bc12a64fa0b1e083a

Create test images via Glance instead of Nova

When possible, create blank test images in Glance instead of relying on
snapshotting, which may not be supported on the hypervisors under test.

Change-Id: I56f79b0ae718b2dcc43853bed3a792f15eccc313