veyron2/ipc: add a registration mechanism for new network types (e.g. bluetooth)
veyron2/ipc: add a registration mechanism for new network types (e.g. bluetooth)

Change-Id: I8ad7496fc5aeec5394d886b8292bfc354d0fc1f3

vanadium/go.v23,vanadium/go.v23,vanadium/go.v23