Automatic merge from submit-queue

Improved code coverage for pkg/kubelet/util.

The test coverage for pkg/kubelet/util.go increased from 45.1%
to 84.3%.



**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**:

```release-note
```