Comment 3 for bug 1672604

I was expecting the children of compute-infra_containers to be all the groups under the container_skel that say belongs_to compute-infra_containers.

https://github.com/openstack/openstack-ansible/blob/master/playbooks/inventory/env.d/nova.yml#L40

The same for memcaching_containers.
https://github.com/openstack/openstack-ansible/blob/master/playbooks/inventory/env.d/memcache.yml#L23-L25

These files just don't seem very intuitive or accurate.