Automatic merge from submit-queue

unit test for kubectl config unset

**What this PR does / why we need it**:
unit test for kubectl config unset

**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**:
think you 

**Release note**:

```release-note
```