[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.
JVM loves small methods, so no real overkill on runtime.

I made it static since static doesn't have access to internal state and there is a slight (not really noticeable) performance gain for using statics over methods.