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Automatic merge from submit-queue (batch tested with PRs 62441, 66702, 67254, 67421, 65309). 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] Apply means to search for existing KubeConfig files in standard locations across kubeadm **What this PR does / why we need it**: Apply means to search for existing KubeConfig files in standard locations across kubeadm. Tasklist: - [x] Use the Join of Dir and File name instead of DefaultKubeConfig - [x] Refactor token.go::findExistingKubeConfig() into a utility in cmd/kubeadm/app/cmd/util - [x] Use the utility in config, upgrade and some of the phases commands that use --kubeconfig **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: ref [kubernetes/kubeadm/#805](https://github.com/kubernetes/kubeadm/issues/805) **Special notes for your reviewer**: /assign @neolit123 **Release note**: ```release-note NONE ```