Enable iscsid health check

This patch enables health check execution for iscsid docker container.

Change-Id: I39dc5fa64b3a9bccf485f335ee0ec6090c48a3c3
Depends-On: Ib82cb849540694106a869ec81694f1159967ee79

docker/services/iscsid.yaml

@@ -90,6 +90,8 @@ outputs:
             net: host
             privileged: true
             restart: always
+            healthcheck:
+              test: /openstack/healthcheck
             volumes:
               list_concat:
                 - {get_attr: [ContainersCommon, volumes]}