ff65bf2fe4
On k8s 1.9, using --discovery-token kubeadm join --discovery-token abcdef.1234567890abcdef --discovery-token-unsafe-skip-ca-verification 1.2.3.4:6443` returns an error, but the node joins successfully with kubeadm join --token abcdef.1234567890abcdef --discovery-token-unsafe-skip-ca-verification 1.2.3.4:6443`