Automatic merge from submit-queue

Remove unused function - verifyDNSPodIsRunning

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

In ea4a7e24, we removed the cluster
DNS verification check from the test, but neglected to remove the
method itself.

**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
NONE
```