Fix configuration of glance images.

 * Previously the glance image ids were always looked up from the
   name, even if the ids were provided to the manifest.
   This change only looks up the ids if they are not provided.
 * The configure_images parameter has been added to allow skipping
   the lookup of image ids by name.
 * The image_name_alt parameter has been added to allow the
   alternate image to vary from the default image.
 * Default image names are no longer provided.  Since the
   provisioning is no longer performed by tempest, no assumptions
   can be made about the results of that step.

Change-Id: I518f1c58a3e7417e60456fa9485d5d13fe002696
Add support for configuring quantum.

Change-Id: Ia2043bfac86397cc02c015b7984b3ef62d75d050