Merge pull request #47408 from shiywang/follow-go-code-style

Automatic merge from submit-queue (batch tested with PRs 47416, 47408, 49697, 49860, 50162)

follow our go code style: error->err

Fixes https://github.com/kubernetes/kubernetes/issues/50189
```release-note
NONE
```

plugin/cmd/kube-scheduler/app/configurator_test.go

@@ -24,8 +24,8 @@ func TestSchedulerConfiguratorFailure(t *testing.T) {
 	sc := &schedulerConfigurator{
 	// policyfile and algorithm are intentionally undefined.
 	}
-	_, error := sc.Create()
-	if error == nil {
+	_, err := sc.Create()
+	if err == nil {
 		t.Fatalf("Expected error message when creating with incomplete configurator.")
 	}
 }