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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 - set peer urls for default etcd instance **What this PR does / why we need it**: Override the default peer URLs for the default etcd instance. Previously we left the defaults, which meant the peer URL was unsecured previously. **Release note**: ```release-note kubeadm - Ensure the peer port is secured by explicitly setting the peer URLs for the default etcd instance. kubeadm - Ensure that the etcd certificates are generated using a proper CN kubeadm - Update generated etcd peer certificate to include localhost addresses for the default configuration. kubeadm - Increase the manifest update timeout to make upgrades a bit more reliable. ```