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Automatic merge from submit-queue (batch tested with PRs 67017, 67190, 67110, 67140, 66873). 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>. Kubeadm join --control-plane main workflow **What this PR does / why we need it**: This PR implements one of the actions defined by https://github.com/kubernetes/kubeadm/issues/751 (checklist form implementing HA in kubeadm). With this PR, kubeadm implements the `kubeadm join --control-plane`workflow, as described in the [KEP 0015-kubeadm-join-master.md](https://github.com/kubernetes/community/blob/master/keps/sig-cluster-lifecycle/0015-kubeadm-join-master.md) with the exception of the update of the `kubeadm-config` ConfigMap that will be completed in a following PR as soon as the implementation in the config file will allow it. **Special notes for your reviewer**: /CC @timothysc @luxas @chuckha @kubernetes/sig-cluster-lifecycle-pr-reviews **Release note**: ``` `kubeadm join` now has the --experimental-control-plane flag that triggers deploy of a new control plane instance on the joining node. ```