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Automatic merge from submit-queue (batch tested with PRs 46787, 46876, 46621, 46907, 46819) kubeadm: Only create bootstrap configmap if not exists. **What this PR does / why we need it**: The fact that this method was not idempotent was breaking kubeadm upgrades. https://github.com/kubernetes/kubeadm/issues/278 **Release note**: ```release-note NONE ```