upstream load balancer uses internal IPs from containers which are not preserved

[deors]

upstream load balancer uses internal IPs from containers to configure the load balancing. however, those internal IPs are not guaranteed to be preserved, and most commonly are not, after the Docker machine restarts. this makes the "_prod" URL to return a 502 bad gateway as the expected underlying containers are no longer exposed at those IPs.
related with issue no. 9 from adop-cartridge-java-environment-template, as the fix will be likely need updates in both projects