Improving the devstack xva build script...

Signed-off-by: Robert Breker <robert.breker@citrix.com>
Use the new/current format to create Devstack XVAs

Signed-off-by: Robert Breker <robert.breker@citrix.com>
Merge branch 'master' of https://github.com/citrix-openstack/qa
Use the correct path for ova.xml and don't skip the devstack installation

Signed-off-by: Robert Breker <robert.breker@citrix.com>