Support for 1.12.1

[cdrage]

Looks like we've got to add a port parameter to the token when updating / using 1.12.1 of Kubeadm:

fatal: [192.168.1.115]: FAILED! => {"changed": true, "cmd": "kubeadm join --ignore-preflight-errors --token b0f7b8.8d1767876297d85c 192.168.1.124:6443 --discovery-token-unsafe-skip-ca-verification", "delta": "0:00:00.027406", "end": "2018-10-17 14:41:58.072164", "msg": "non-zero return code", "rc": 3, "start": "2018-10-17 14:41:58.044758", "stderr": "[tlsBootstra
pToken: Invalid value: \"\": the bootstrap token is invalid, discovery: Invalid value: \"\": discoveryToken or discoveryFile must be set, discoveryTokenAPIServers: Invalid value: \"b0f7b8.8d1767876297d85c\": address b0f7b8.8d1767876297d85c: missing port in address]", "stderr_lines": ["[tlsBootstrapToken: Invalid value: \"\": the bootstrap token is invalid, discov
ery: Invalid value: \"\": discoveryToken or discoveryFile must be set, discoveryTokenAPIServers: Invalid value: \"b0f7b8.8d1767876297d85c\": address b0f7b8.8d1767876297d85c: missing port in address]"], "stdout": "[validation] WARNING: kubeadm doesn't fully support multiple API Servers yet", "stdout_lines": ["[validation] WARNING: kubeadm doesn't fully support mul
tiple API Servers yet"]}