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2b190bd2f1
Automatic merge from submit-queue (batch tested with PRs 48295, 48298, 47339, 44910, 48037) kubeadm: Remove v1.6 version gates, cleanup unused code, etc. **What this PR does / why we need it**: - Removes v1.6 version gates and requires a control plane version of v1.7.0 and above - Removes unused/unnecessary functions that got freed up as a consequence of that **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # Fixes: kubernetes/kubeadm#327 **Special notes for your reviewer**: This PR targets v1.8, can be merged first when the code freeze is lifted **Release note**: ```release-note NONE ``` @kubernetes/sig-cluster-lifecycle-pr-reviews @timothysc @mikedanese @pipejakob