Replace metrics Clock with our own NanoClock

So we don't have to add the metrics jar as a dependency just to get
the clock functionality.

Change-Id: Ie6fff10e9917e9eb10d2347bd24c6d5041a1137f
Signed-off-by: Duarte Nunes <duarte@midokura.com>
Makes Netlink layer more compositional

Change-Id: Ie1419c330eef58ae7d7be368eba6a78df376fae6
Signed-off-by: Duarte Nunes <duarte@midokura.com>