This is using the __END__/DATA trick in Ruby which is literally the worst thing
I know how to do in Ruby (https://shifteleven.com/articles/2009/02/09/useless-ruby-tricks-data-and-__end__/)
This code will need to be eventually replaced with a proper smart proxy, but if
you're going to write a dumb proxy, make it a REALLY DUMB proxy
Instead this will dynamically generate configuration when the proxy comes
online. This will be a lot more reasonable since Kubernetes sets some
environment variables for the pod (e.g JENKINS_RTYLER_SERVICE_HOST) which we'll
need to balanacing to the Jenkins masters
R. Tyler Croy