Docker healthcheck timings - add startup delay and changed interval (#9913)

* Add healthcheck startup delay by 5secs and reduced interval check to 15s
to reduce waiting time for docker aware edge routers bringing an
instance online

docker/Dockerfile

@@ -88,5 +88,5 @@ EXPOSE 8008/tcp 8009/tcp 8448/tcp
 
 ENTRYPOINT ["/start.py"]
 
-HEALTHCHECK --interval=1m --timeout=5s \
+HEALTHCHECK --start-period=5s --interval=15s --timeout=5s \
     CMD curl -fSs http://localhost:8008/health || exit 1