Add a CLI to kill yarn container

One of my teammates saw an issue when there was dangling container. The reason could have been because of a bug in YARN application or unexpected environment failure. It is nice if YARN can handle this from YARN framework. I suggest YARN to provide a CLI to kill container(s).

Security should be obeyed. In first phase, we could allow only YARN admin to kill container(s).

The method should also work in both Linux and Windows platform.