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
The default behavior when not using config-download remains unchanged.
(cherry picked from commit