Imports
- github.com/pkg/errors
- github.com/spf13/cobra
- k8s.io/client-go/util/cert
- k8s.io/client-go/tools/clientcmd
- k8s.io/kubernetes/cmd/kubeadm/app/constants
- k8s.io/kubernetes/cmd/kubeadm/app/util/pubkeypin
- k8s.io/kubernetes/cmd/kubeadm/app/util/kubeconfig
- k8s.io/kubernetes/pkg/util/normalizer