avoid klog Info calls without verbosity

In the following code pattern, the log message will get logged with v=0 in JSON
output although conceptually it has a higher verbosity:

   if klog.V(5).Enabled() {
       klog.Info("hello world")
   }

Having the actual verbosity in the JSON output is relevant, for example for
filtering out only the important info messages. The solution is to use
klog.V(5).Info or something similar.

Whether the outer if is necessary at all depends on how complex the parameters
are. The return value of klog.V can be captured in a variable and be used
multiple times to avoid the overhead for that function call and to avoid
repeating the verbosity level.

pkg/controller/resourcequota/resource_quota_controller.go

@@ -25,7 +25,7 @@ import (
 
 	"k8s.io/klog/v2"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -435,8 +435,8 @@ func (rq *Controller) Sync(discoveryFunc NamespacedResourcesFunc, period time.Du
 		defer rq.workerLock.Unlock()
 
 		// Something has changed, so track the new state and perform a sync.
-		if klog.V(2).Enabled() {
-			klog.Infof("syncing resource quota controller with updated resources from discovery: %s", printDiff(oldResources, newResources))
+		if klogV := klog.V(2); klogV.Enabled() {
+			klogV.Infof("syncing resource quota controller with updated resources from discovery: %s", printDiff(oldResources, newResources))
 		}
 
 		// Perform the monitor resync and wait for controllers to report cache sync.