resources: Update state checks

The mgmt graph depends on state tracking to eliminate redundant pokes.
With the Watch loop now able to produce events quickly, it should no
longer play a part in determining the vertex state. This simplifies the
resource API as well!

resources/timer.go

@@ -92,7 +92,6 @@ func (obj *TimerRes) Watch(processChan chan *event.Event) error {
 	var send = false
 
 	for {
-		obj.SetState(ResStateWatching)
 		select {
 		case <-obj.ticker.C: // received the timer event
 			send = true