Fix golang-ci linter errors (#10128)

* Fix golang-ci linter errors

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix gofmt errors

Signed-off-by: z1cheng <imchench@gmail.com>

* Add nolint comment to defaults.Backend in Configuration

Signed-off-by: z1cheng <imchench@gmail.com>

* Add #nosec comment to rand.New func

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix errcheck warnings

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix gofmt check

Signed-off-by: z1cheng <imchench@gmail.com>

* Fix unit tests and comments

Signed-off-by: z1cheng <imchench@gmail.com>

---------

Signed-off-by: z1cheng <imchench@gmail.com>

internal/ingress/status/status.go

@@ -95,10 +95,13 @@ func (s statusSync) Run(stopCh chan struct{}) {
 
 	// when this instance is the leader we need to enqueue
 	// an item to trigger the update of the Ingress status.
-	wait.PollUntil(time.Duration(UpdateInterval)*time.Second, func() (bool, error) {
+	err := wait.PollUntil(time.Duration(UpdateInterval)*time.Second, func() (bool, error) {
 		s.syncQueue.EnqueueTask(task.GetDummyObject("sync status"))
 		return false, nil
 	}, stopCh)
+	if err != nil {
+		klog.ErrorS(err, "error running poll")
+	}
 }
 
 // Shutdown stops the sync. In case the instance is the leader it will remove the current IP

internal/ingress/status/status_test.go

@@ -325,7 +325,9 @@ func TestStatusActions(t *testing.T) {
 	//  wait for the election
 	time.Sleep(100 * time.Millisecond)
 	// execute sync
-	fk.sync("just-test")
+	if err := fk.sync("just-test"); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
 	// PublishService is empty, so the running address is: ["11.0.0.2"]
 	// after updated, the ingress's ip should only be "11.0.0.2"
 	newIPs := []networking.IngressLoadBalancerIngress{{