Enable cinder-api health check

This patch enables health check execution for cinder-api docker container.

Change-Id: I4c51f8b7260eb04cd8a8c502ed1b80df4f025880
Depends-On: Ib82cb849540694106a869ec81694f1159967ee79

docker/services/cinder-api.yaml

@@ -146,6 +146,8 @@ outputs:
             # NOTE(mandre) kolla image changes the user to 'cinder', we need it
             # to be root to run httpd
             user: root
+            healthcheck:
+              test: /openstack/healthcheck
             volumes:
               list_concat:
                 - {get_attr: [ContainersCommon, volumes]}