Revert "Use K8s 1.14 and add kubeadm experimental control plane mode (#4317)" (#4510)

This reverts commit 316508626d.

roles/kubernetes/master/tasks/kubeadm-kubeconfig.yml

@@ -0,0 +1,34 @@
+---
+- name: Backup old configuration files
+  copy:
+    src: "{{ kube_config_dir }}/{{ item.src }}"
+    dest: "{{ kube_config_dir }}/{{ item.dest }}"
+    remote_src: yes
+  with_items:
+    - {src: admin.conf, dest: admin.conf.old}
+    - {src: kubelet.conf, dest: kubelet.conf.old}
+    - {src: controller-manager.conf, dest: controller-manager.conf.old}
+    - {src: scheduler.conf, dest: scheduler.conf.old}
+  ignore_errors: yes
+
+- name: Remove old configuration files
+  file:
+    path: "{{ kube_config_dir }}/{{ item }}"
+    state: absent
+  with_items:
+    - admin.conf
+    - kubelet.conf
+    - controller-manager.conf
+    - scheduler.conf
+
+- name: Generate new configuration files
+  command: "{{ bin_dir }}/kubeadm init phase kubeconfig all --config={{ kube_config_dir }}/kubeadm-config.yaml"
+  environment: "{{ proxy_env }}"
+  when: kubeadm_version is version('v1.13.0', '>=')
+  ignore_errors: yes
+
+- name: Generate new configuration files
+  command: "{{ bin_dir }}/kubeadm alpha phase kubeconfig all --config={{ kube_config_dir }}/kubeadm-config.yaml"
+  environment: "{{ proxy_env }}"
+  when: kubeadm_version is version('v1.13.0', '<')
+  ignore_errors: yes