Get rid of old minion proxy code in favor of new, better proxy code

Now minions and services use the same proxy.

Changes:

What used to be ```/proxy/minion/minion_name``` is now ```/api/v1beta1/proxy/minions/fully_qualified_minion_name```.
On second thought, the proxying code has no idea what the thing it's headed to supports, so it needs to be told. We really just shouldn't let kubelet spill its guts over unsecured sessions.

TODO added.