Fix use of formatted output at the debug logging level.

pkg/controller/service.go

@@ -350,7 +350,7 @@ func (worker *NamespaceWorker) syncSvc(key string) update.Status {
 			continue
 		}
 		updateVCL = true
-		worker.log.Debug("Requeueing Ingress %s/%s after changed "+
+		worker.log.Debugf("Requeueing Ingress %s/%s after changed "+
 			"Varnish service %s/%s: %+v", ing.Namespace,
 			ing.Name, svc.Namespace, svc.Name, ing)
 		worker.queue.Add(&SyncObj{Type: Update, Obj: ing})