Adds healthcheck to POL

Change-Id: I7680e9d4ba70e7d46ff155071cfb75dca64f5e35
Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>
diff --git a/docker/POL/Dockerfile b/docker/POL/Dockerfile
index fde710f..6de7c71 100644
--- a/docker/POL/Dockerfile
+++ b/docker/POL/Dockerfile
@@ -55,4 +55,7 @@
 
 ENV OSMPOL_GLOBAL_LOG_LEVEL INFO
 
+HEALTHCHECK --interval=5s --timeout=2s --retries=12 \
+  CMD osm-pol-healthcheck || exit 1
+
 CMD /bin/bash scripts/start.sh