Output service_metadata_settings in docker services.yaml

This output gets nova metadata into the servers this is deployed to and
is necessary for the TLS-everywhere work.

bp tls-via-certmonger-containers

Change-Id: Iff54f7af9c63a529f88c6455047f6584d29154b4

docker/services/services.yaml

@@ -89,3 +89,5 @@ outputs:
           # Note we use distinct() here to filter any identical tasks, e.g yum update for all services
           expression: $.data.where($ != null).select($.get('upgrade_batch_tasks')).where($ != null).flatten().distinct()
           data: {get_attr: [ServiceChain, role_data]}
+      service_metadata_settings:
+        get_attr: [PuppetServices, role_data, service_metadata_settings]