Updated openstack/openstack
Project: openstack-dev/devstack  293a40545006100be18a731480e2206c1261423c
null
Set DEFAULT_IMAGE_NAME for Docker hypervisor

This allows the tempest configuration to set the right
image for booting docker containers with Nova.

Since glance uploads are not yet integrated in devstack,
IMAGE_URLS remains empty.

Change-Id: I5df153cd1d5e1411bb3c11816122ce280148e129