This patch removes more of the DockerNamespace references as part
of the cleanup/reorg of the container configuration patches.
This also adds a centos-rdo environment file for use with
the new interface. This file was generated with the command
"openstack overcloud container image prepare"
Depends-On: I729fa00175cb36b02b882d729aae5ff06d0e3fbc
Depends-On: I292162d66880278de09f7acbdbf02e2312c5bb2b
Co-Authored-By: Dan Prince <dprince@redhat.com>
Change-Id: Ice7b57c25248634240a6dd6e14e6d411e7806326
8a305da32a