Docker compute role configured via Puppet

Docker compute role configured via Puppet

This change adds a containerized version of the overcloud compute node for
TripleO. Configuration files are generated via OpenStack Puppet modules
which are then used to externally configure kolla containers for
each OpenStack service.

See the README-containers.md file for more information on how to set this up.

This uses AtomicOS as a base operating system and requires that we bootstrap
the image with a container which contains the required os-collect-config agent
hooks to support running puppet, shell scripts, and docker compose.

Change-Id: Ic8331f52b20a041803a9d74cdf0eb81266d4e03c
Co-Authored-By: Ian Main <imain@redhat.com>
Co-Authored-By: Ryan Hallisey <rhallise@redhat.com>