Add environments/deployed-networks.yaml
Add environments/deployed-networks.yaml

The environment can be used alongside
environments/deployed-ports.j2.yaml for scenarios where openstack
overcloud network provision was not used, and in scenarios where Neutron
is not installed.

Change-Id: Iad3d2e4ba4108b0de5481b7408342b7c8d209a36
Signed-off-by: James Slagle <33ab48cedd1a7cf7a68e1b587db88f55f753652f@redhat.com>

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