RC/RS: Use ControllerRef to route watch events.

This is part of the completion of ControllerRef, as described here:

https://github.com/kubernetes/community/blob/master/contributors/design-proposals/controller-ref.md#watches

This also removes the need for the Pod->Controller mapping cache in RC
and RS. This mapping is now persisted in the Pod's ControllerRef
instead.

test/integration/quota/quota_test.go

@@ -96,7 +96,6 @@ func TestQuota(t *testing.T) {
 		informers.Core().V1().ReplicationControllers(),
 		clientset,
 		replicationcontroller.BurstReplicas,
-		4096,
 	)
 	rm.SetEventRecorder(&record.FakeRecorder{})
 	go rm.Run(3, controllerCh)
@@ -280,7 +279,6 @@ func TestQuotaLimitedResourceDenial(t *testing.T) {
 		informers.Core().V1().ReplicationControllers(),
 		clientset,
 		replicationcontroller.BurstReplicas,
-		4096,
 	)
 	rm.SetEventRecorder(&record.FakeRecorder{})
 	go rm.Run(3, controllerCh)