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Automatic merge from submit-queue kubeadm: Upload configuration used at 'kubeadm init' time to ConfigMap for easier upgrades **What this PR does / why we need it**: Uploads config used to a ConfigMap so we can upgrade a cluster seamlessly without forcing the user to re-specify all options they specified the first time. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # fixes: https://github.com/kubernetes/kubeadm/issues/373 **Special notes for your reviewer**: This should be a cherrypick-candidate for easier upgrading to v1.8 cc @wojtek-t **Release note**: ```release-note kubeadm: Upload configuration used at 'kubeadm init' time to ConfigMap for easier upgrades ``` @kubernetes/sig-cluster-lifecycle-pr-reviews @timothysc