Merge pull request #59728 from wgliang/master.append

Automatic merge from submit-queue (batch tested with PRs 59740, 59728, 60080, 60086, 58714). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

more concise to merge the slice

**What this PR does / why we need it**:
more concise to merge the slice

**Special notes for your reviewer**:

pkg/controller/service/service_controller_test.go

@@ -247,9 +247,8 @@ func TestUpdateNodesInExternalLoadBalancer(t *testing.T) {
 		controller, cloud, _ := newController()
 
 		var services []*v1.Service
-		for _, service := range item.services {
-			services = append(services, service)
-		}
+		services = append(services, item.services...)
+
 		if err := controller.updateLoadBalancerHosts(services, nodes); err != nil {
 			t.Errorf("unexpected error: %v", err)
 		}

pkg/scheduler/core/generic_scheduler_test.go

@@ -404,9 +404,8 @@ func TestGenericScheduler(t *testing.T) {
 			cache.AddNode(&v1.Node{ObjectMeta: metav1.ObjectMeta{Name: name}})
 		}
 		pvcs := []*v1.PersistentVolumeClaim{}
-		for _, pvc := range test.pvcs {
-			pvcs = append(pvcs, pvc)
-		}
+		pvcs = append(pvcs, test.pvcs...)
+
 		pvcLister := schedulertesting.FakePersistentVolumeClaimLister(pvcs)
 
 		scheduler := NewGenericScheduler(

pkg/volume/rbd/rbd.go

@@ -590,9 +590,7 @@ func (r *rbdVolumeProvisioner) Provision() (*v1.PersistentVolume, error) {
 		switch dstrings.ToLower(k) {
 		case "monitors":
 			arr := dstrings.Split(v, ",")
-			for _, m := range arr {
-				r.Mon = append(r.Mon, m)
-			}
+			r.Mon = append(r.Mon, arr...)
 		case "adminid":
 			r.adminId = v
 		case "adminsecretname":