[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.
I think default backlog value is OS specific. Can't we just set it to 0 as default value so that default implementation value will be used.

http://download.java.net/jdk7/archive/b123/docs/api/java/net/ServerSocket.html#ServerSocket(int, int)