Update factory.go informers to update equivalence cache

Fix tombstone

Add e2e to verify equivalence cache

Addressing nits in factory,go and e2e

Update build files

test/integration/scheduler/extender_test.go

@@ -370,6 +370,7 @@ func TestSchedulerExtender(t *testing.T) {
 		informerFactory.Apps().V1beta1().StatefulSets(),
 		informerFactory.Core().V1().Services(),
 		v1.DefaultHardPodAffinitySymmetricWeight,
+		enableEquivalenceCache,
 	)
 	schedulerConfig, err := schedulerConfigFactory.CreateFromConfig(policy)
 	if err != nil {