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/master/tasks/users-file.yml

@@ -0,0 +1,14 @@
+---
+- name: Make sure the users directory exits
+  file:
+    path: "{{ kube_users_dir }}"
+    state: directory
+    mode: o-rwx
+    group: "{{ kube_cert_group }}"
+
+- name: Populate users for basic auth in API
+  template:
+    src: known_users.csv.j2
+    dest: "{{ kube_users_dir }}/known_users.csv"
+    backup: yes
+  notify: Master | set secret_changed