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Automatic merge from submit-queue. 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 the cluster with pre-existing client certificate if provided **What this PR does / why we need it**: support `kubeadm join` with a pre-existing client certificate **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes kubernetes/kubeadm#945 **Special notes for your reviewer**: /cc @luxas @timothysc @kubernetes/sig-cluster-lifecycle-pr-reviews **Release note**: ```release-note kubeadm now can join the cluster with pre-existing client certificate if provided ```