Import net-config-simple-bridge.yaml from tropleo-ci repo
Import net-config-simple-bridge.yaml from tropleo-ci repo

This file has been used for the containerized undercloud so we can
deploy a simple bridge with os-net-config.

We're moving the environments used for CI into THT, so we can branch
them. This is part of this effort.

Change-Id: I4255120e12123568a388c75956e6e8d32dec66aa

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates