Add smoke/health tests to OSM stage_3

Change-Id: I11b5aab4d4fcd496e47ff8d483ebd4ad771cd780
Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>
diff --git a/docker/RO/Dockerfile b/docker/RO/Dockerfile
index cfccb68..0607d91 100644
--- a/docker/RO/Dockerfile
+++ b/docker/RO/Dockerfile
@@ -47,4 +47,6 @@
 ENV RO_DB_NAME=mano_db
 ENV RO_DB_OVIM_NAME=mano_vim_db
 
+HEALTHCHECK --interval=5s --timeout=2s --retries=12 \
+  CMD curl --silent --fail localhost:9090/openmano/tenants || exit 1
 CMD /bin/RO/start.sh