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Automatic merge from submit-queue (batch tested with PRs 39199, 37273, 29183, 39638, 40199) Refactor/improve the kubeadm generation of certificates **What this PR does / why we need it**: Continues to refactor/improve kubeadm towards beta. **Special notes for your reviewer**: Modify the certs that are generated; generate on demand (if not exist) and only four files instead of eight previously. Basically implements what has been discussed so far in https://github.com/kubernetes/kubeadm/pull/100 **Release note**: ```release-note NONE ``` cc @mikedanese @pires @lukemarsden @errordeveloper @dgoodwin @roberthbailey