Merge pull request #54053 from WanLinghao/cmd_test_unused_function

Automatic merge from submit-queue. 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>.

remove unused function in cmd_test.go

PR removed unused defaultClientConfigForVersion（） functions from cmd_test.go.



**What this PR does / why we need it**:

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```
NONE
```

pkg/kubectl/cmd/cmd_test.go

@@ -75,17 +75,6 @@ func defaultClientConfig() *restclient.Config {
 	}
 }
 
-func defaultClientConfigForVersion(version *schema.GroupVersion) *restclient.Config {
-	return &restclient.Config{
-		APIPath: "/api",
-		ContentConfig: restclient.ContentConfig{
-			NegotiatedSerializer: scheme.Codecs,
-			ContentType:          runtime.ContentTypeJSON,
-			GroupVersion:         version,
-		},
-	}
-}
-
 func testData() (*api.PodList, *api.ServiceList, *api.ReplicationControllerList) {
 	pods := &api.PodList{
 		ListMeta: metav1.ListMeta{