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Automatic merge from submit-queue Decouple master bootstrap from CSR in kubeadm <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, read our contributor guidelines https://github.com/kubernetes/kubernetes/blob/master/CONTRIBUTING.md and developer guide https://github.com/kubernetes/kubernetes/blob/master/docs/devel/development.md 2. If you want *faster* PR reviews, read how: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/faster_reviews.md 3. Follow the instructions for writing a release note: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes --> **What this PR does / why we need it**: enhance `kubeadm` to allow for parallel provisioning of API endpoints and slave nodes **Fixes**: https://github.com/kubernetes/kubernetes/issues/33542 **Special notes for your reviewer**: This is work in progress, trying to * Introduce a concurrent retry mechanism for bootstrapping with a single API endpoint * Refactor API client creation, decouple from CSR