This ps moves to use a container sultaible for use as the heat engine
for all possible admin jobs - it is lighter than the kolla-toolbox image
and makes it easy to swap out to other image sets. This is as the heat
engine container should contain the openstack client (with all required
libs for the cloud) and the oslo_db supporting libs required by the db
management jobs, as well as the oslo_messaging libs required for future
rabbitmq management expansion.
Change-Id: I5451c15c8fb49c85b4f254cc60156420bee2efea
ceb30e8cc7