Imports github.com/coreos/etcd/pkg/transport k8s.io/kubernetes/cmd/kubeadm/app/util/staticpod k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm github.com/coreos/etcd/clientv3 k8s.io/kubernetes/cmd/kubeadm/app/constants Standard library imports context crypto/tls fmt path/filepath strings time