veyron/lib/netconfig: change netconfig watchers to monitor route changes as well.

  o This is for avoiding calling nestats.GetAll(), which is expensive, in every RPC call.
  o I couldn't find any documentation on netconfig monitoring, so I'm
    not sure whether this is a right way to do.

Change-Id: I17c0aad0c434f8d7ec6323280b79ccc2dc260386
2 files changed