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Automatic merge from submit-queue (batch tested with PRs 60585, 62398, 62258, 62042). 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: surface external etcd preflight validation errors **What this PR does / why we need it**: This PR fixes a bug where errors that could occur while running preflight against an external etcd cluster were not being surfaced to the user. **Which issue(s) this PR fixes** : Fixes https://github.com/kubernetes/kubeadm/issues/719 **Release note**: ```release-note kubeadm: surface external etcd preflight validation errors ```