Imports
- k8s.io/kubernetes/cmd/kubeadm/app/util/certs
- k8s.io/kubernetes/cmd/kubeadm/app/util/config
- k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta1
- k8s.io/kubernetes/cmd/kubeadm/app/util/pkiutil
- k8s.io/kubernetes/cmd/kubeadm/app/constants
- k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm
- github.com/lithammer/dedent