* Rename a field to make it more obvious.
* Fix some comments and other minor artifacts.
Verified by hitting the service on 443, and by hitting the master on 8080,
6443, and 7080.
Part of #108.
Also:
* Added hyperkube cmd (not built by default yet).
* Added version support to hyperkube
* Remove health_check_minions flag from apiserver as it is no longer used with #3733