Merge pull request #3198 from riverzhang/fix-kubeadm-v1alpha1

Fix kubeadm v1alpha1 configure

roles/kubernetes/master/templates/kubeadm-config.v1alpha1.yaml.j2

-apiVersion: kubeadm.k8s.io/v1alpha2
+apiVersion: kubeadm.k8s.io/v1alpha1
 kind: MasterConfiguration
 api:
 {% if groups['kube-master'] | length > 1 and kubeadm_config_api_fqdn is defined %}
@@ -8,7 +8,6 @@ api:
  bindPort: {{ kube_apiserver_port }}
 {% endif %}
 etcd:
-  external:
   endpoints:
 {% for endpoint in etcd_access_addresses.split(',') %}
   - {{ endpoint }}
@@ -29,12 +28,6 @@ kubeProxy:
 {% if kube_proxy_mode == 'ipvs' and kube_version | version_compare('v1.10', '<') %}
     featureGates: SupportIPVSProxyMode=true
     mode: ipvs
-{% elif kube_proxy_mode == 'ipvs' %}
-kubeProxy:
-  config:
-    featureGates:
-      SupportIPVSProxyMode: true
-    mode: ipvs
 {% endif %}
 {% if kube_proxy_nodeport_addresses %}
     nodePortAddresses: [{{ kube_proxy_nodeport_addresses_cidr }}]