[TACHYON-62] Netty

Netty implementation of the data server.

This patch is not done yet.  Its intent is to show the work I have right now for commenting.

This PR should not be merged until performance results come in.
Good blog. Thanks.

For these two methods, they are not in real critical path in the worker code. They are not called by outside of the class either. So, let's change them back to non-static unless there is a big win.