nanny: register device also on device-up event

Useful for devices like ovs bridge which receive device-create
followed by device-up event, which triggers refresh then and
device is considered ready afterwards.
Should not cause any harm, since ni_nanny_register_device()
checks if such device is already registered and return if so.

nanny/nanny.c

@@ -788,6 +788,7 @@ ni_nanny_process_fsm_event(ni_fsm_t *fsm, ni_ifworker_t *w, ni_fsm_event_t *ev)
 
 	switch (ev->event_type) {
 	case NI_EVENT_DEVICE_READY:
+	case NI_EVENT_DEVICE_UP:
 		ni_nanny_register_device(mgr, w);
 		break;