A request from mnaser to use raw images for the provider. There is
also a proposed change to os-client-config to add this, but will need
to be tagged as a new release.
See: https://review.openstack.org/554351
We can revert once os-client-config has been released to pypi.
Change-Id: Ifc3d5656b7b972d5978b4d806c41bf2cc3443842
Signed-off-by: Paul Belanger <pabelanger@redhat.com>