Add missing metadata_settings from docker services

These are needed for the TLS everywhere bits.

Change-Id: I81fcf453fc1aaa2545e0ed24013f0f13b240a102

docker/services/nova-placement.yaml

@@ -100,6 +100,8 @@ outputs:
                   - /var/log/containers/nova:/var/log/nova
             environment:
               - KOLLA_CONFIG_STRATEGY=COPY_ALWAYS
+      metadata_settings:
+        get_attr: [NovaPlacementBase, role_data, metadata_settings]
       host_prep_tasks:
         - name: create persistent logs directory
           file: