Implement multi-scheduler:

1. Name default scheduler with name `kube-scheduler`
2. The default scheduler only schedules the pods meeting the following condition:
	- the pod has no annotation "scheduler.alpha.kubernetes.io/name: <scheduler-name>"
	- the pod has annotation "scheduler.alpha.kubernetes.io/name: kube-scheduler"

update gofmt

update according to @david's review

run hack/test-integration.sh, hack/test-go.sh and local e2e.test

test/component/scheduler/perf/util.go

@@ -58,7 +58,7 @@ func mustSetupScheduler() (schedulerConfigFactory *factory.ConfigFactory, destro
 		Burst:        5000,
 	})
 
-	schedulerConfigFactory = factory.NewConfigFactory(c, nil)
+	schedulerConfigFactory = factory.NewConfigFactory(c, nil, api.DefaultSchedulerName)
 	schedulerConfig, err := schedulerConfigFactory.Create()
 	if err != nil {
 		panic("Couldn't create scheduler config")