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Automatic merge from submit-queue (batch tested with PRs 54837, 55970, 55912, 55898, 52977). 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>. Consolidate DNS codes in kubelet pkg **What this PR does / why we need it**: Follow up of https://github.com/kubernetes/kubernetes/pull/55651. Ref https://github.com/kubernetes/kubernetes/pull/55651#discussion_r151042281. This PRs consolidate DNS related codes in kubelet so that it could be self-contained. There is no actual code changes again. **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Ref https://github.com/kubernetes/kubernetes/issues/55451 **Special notes for your reviewer**: cc @bowei @thockin **Release note**: ```release-note NONE ```