Add sample java app to test comms. with VTEP

Needs more work, but this should give an idea of how this application
should run. I haven't tested yet so we need, waiting for the VTEP
emulator setup.

Change-Id: I657d2152c9d0e42bdb0add3b6c08b92a82f94f83
Signed-off-by: Galo Navarro <galo@midokura.com>