Automatic merge from submit-queue (batch tested with PRs 45860, 45119, 44525, 45625, 44403)
coredns: support IPv6 record set
Added support for AAAA record for coredns and included unit test.
Refactored common test code to reduce duplication from added test and
existing tests.
Fixed function names in comments for Google and AWS tests to match
actual test name in this area.
**What this PR does / why we need it**:
Adding IPv6 support to kubernetes, once piece at a time. :)
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#44351
**Special notes for your reviewer**:
In addition to the change and unit test method, I did some minor refactoring (since the UT was a near clone of an existing test). Fixed typos in related test methods' comment lines. Please let me know if this is OK (I was thinking it was a small change, but don't know the protocol here), or if I need to break it into multiple commits.
**Release note**:
```NONE
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