update pod.json for new internal command and update router cmd descripti...

Updates for https://github.com/openshift/origin/pull/376, optional integration with e2e test to curl the route instead of direct to the pod.  Documentation update
(spoke to this with @pweil- elsewhere, but stating here for others): We've been down this path before, and 172.17.42.1 is assumed to be stable (it's what we use for the registry pod). Nothing in our VMs will bind that that, keeping it free for Docker. The only time this assumption should break is with a misconfigured VM, which means we'd need to fix the VM setups.

There's upstream work to figure out how to tell pods about the master. Using a lookup here would mean having to apply the same lookup to deal with the registry (which we've tried, and is a bad UX).

Hard-code 172.17.42.1 for now pending upstream. If 172.17.42.1 can be proven to break down in our general VM configs, let's root-cause those and fix them to maintain the assumption.