Automatic merge from submit-queue (batch tested with PRs 56952, 57697). 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 /k8s.io/kubernetes/pkg/kubectl/testing
**What this PR does / why we need it**:
The package `/k8s.io/kubernetes/pkg/kubectl/testing` only have one type `TestStruct` and only used in `printers_test.go`, so removed it and created a similar type in `printers_test.go`.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixeskubernetes/kubectl#164
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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