kubeadm support (#1631)

* kubeadm support

* move k8s master to a subtask
* disable k8s secrets when using kubeadm
* fix etcd cert serial var
* move simple auth users to master role
* make a kubeadm-specific env file for kubelet
* add non-ha CI job

* change ci boolean vars to json format

* fixup

* Update create-gce.yml

* Update create-gce.yml

* Update create-gce.yml

roles/kubernetes-apps/ansible/tasks/main.yml

@@ -8,6 +8,18 @@
   delay: 6
   when: inventory_hostname == groups['kube-master'][0]
 
+- name: kubeadm | Delete kubeadm kubedns
+  kube:
+    name: "kubedns"
+    namespace: "{{ system_namespace }}"
+    kubectl: "{{bin_dir}}/kubectl"
+    resource: "deploy"
+    state: absent
+  when:
+    - kubeadm_enabled|default(false)
+    - kubeadm_init.changed|default(false)
+    - inventory_hostname == groups['kube-master'][0]
+
 - name: Kubernetes Apps | Lay Down KubeDNS Template
   template:
     src: "{{item.file}}"