Add example of supporting auto clustering stateful docker image such as rabbitmq

[AceHack]

Would love to see how to get this image up and running in SF in HA mode that takes advantage of rabbit mq ha policies. It's trivial to do in swarm or kubernetes.

https://hub.docker.com/r/pivotalrabbitmq/rabbitmq-autocluster/

https://www.rabbitmq.com/ha.html