Comment 10 for bug 1746336

Reviewed: https://review.openstack.org/582424
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=54010e2358850df97d34f5f9e67b89a800dba67d
Submitter: Zuul
Branch: stable/queens

commit 54010e2358850df97d34f5f9e67b89a800dba67d
Author: James Slagle <email address hidden>
Date: Fri Jan 12 15:52:26 2018 -0500

    Support SshKnownHostsDeployment with config-download

    Add support for the SshKnownHostsDeployment resources to
    config-download. Since the deployment resources relied on Heat outputs,
    they were not supported with the default handling from tripleo-common
    that relies on the group_vars mechanism.

    Instead, this patch refactors the templates to add the known hosts
    entries as global_vars to deploy_steps_playbook.yaml, and then includes
    the new tripleo-ssh-known-hosts role from tripleo-common to apply the
    same configuration that the Heat deployment did.

    Since these deployments no longer need to be triggered when including
    config-download-environment.yaml, a mapping is added that can be
    overridden to OS::Heat::None to disable the deployment resources when
    using config-download.

    The default behavior when not using config-download remains unchanged.

    Closes-Bug: #1746336
    Change-Id: Ia334fe6adc9a8ab228f75cb1d0c441c1344e2bd9
    (cherry picked from commit 088d5c12f0f37e24d836e6f8791f41fbeba3326d)