Comment 22 for bug 1800811

Reviewed: https://review.openstack.org/629963
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=c2f9d77f5ad4532205199f01b235b53a0d4db167
Submitter: Zuul
Branch: stable/queens

commit c2f9d77f5ad4532205199f01b235b53a0d4db167
Author: Harald Jensås <email address hidden>
Date: Tue Jan 8 12:23:52 2019 +0100

    Reno only - Check for available networks for a role

    Since change: I07822ec0cba7eed352c0010eb893b5e5a522e95c
    resources are no longer created for networks that are not
    defined in roles data. While this is an improvement we
    need to communicate this change.

    There is tribal knowledge and documentation that failed
    reflect the requirement to add networks to roles data
    since the introduction of composable networks in Pike.

    Prior to Pike adding a network to a role was achived by
    overriding the resource_registry entry to not use the
    noop.yaml fake port (fall back to ctlplane) template.
    i.e to add External network to compute role the
    following was commonly added to network-environment.yaml

      OS::TripleO::Compute::Ports::ExternalPort:
        ../network/ports/external.yaml

    NOTE: Current OVN-DVR and ODL doc's downstream uses the
          resource_registry override, whitout also adding
          the network to roles data.

    Related-Bug: #1800811
    Change-Id: I6c03c7a2bd6f369bf35a9e479a97302c9a455197
    (cherry picked from commit 991e0fc0c0c9fc24b53b3760b396de75d9fb52ad)