Merge pull request #2461 from woopstar/patch-11

Add support to kubeadm too

roles/kubernetes/master/templates/kubeadm-config.yaml.j2

@@ -37,6 +37,7 @@ apiServerExtraArgs:
   admission-control: {{ kube_apiserver_admission_control | join(',') }}
   apiserver-count: "{{ kube_apiserver_count }}"
   service-node-port-range: {{ kube_apiserver_node_port_range }}
+  kubelet-preferred-address-types: "{{ kubelet_preferred_address_types }}"
 {% if kube_basic_auth|default(true) %}
   basic-auth-file: {{ kube_users_dir }}/known_users.csv
 {% endif %}