[WIP] [DO NOT MERGE] Router active active

Opening this up for feedback.  This branch contains a working example of round robin wild card DNS via BIND mapping to OpenShift routers.  Definitely needs improvements about how router configs are digested by the DNS container but didn't want to code that up yet if it wasn't on the right track.
There is certainly nothing OpenShift specific about this work.  I just followed the router pattern for commands but it definitely doesn't need to be part of the OpenShift distro if we don't want it to be.  

RE: running our own DNS server. We don't technically need a server to provide out of the box DNS resolution for customers in deployed environments.  Running DNS as a pod is just an implementation detail, nothing special about it.  If we don't intend on doing that then we can disregard this PR.

RE: customers running their own DNS.  They can do that, they just need to know our router IP address that they're assigned to (or, preferably, they create a CNAME pointing their custom name to our router name)