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

This reverts commit 316508626d.

roles/kubernetes/master/tasks/kubeadm-secondary-legacy.yml

@@ -1,43 +0,0 @@
-- name: slurp kubeadm certs
-  slurp:
-    src: "{{ item }}"
-  with_items:
-    - "{{ kube_cert_dir }}/apiserver.crt"
-    - "{{ kube_cert_dir }}/apiserver.key"
-    - "{{ kube_cert_dir }}/apiserver-kubelet-client.crt"
-    - "{{ kube_cert_dir }}/apiserver-kubelet-client.key"
-    - "{{ kube_cert_dir }}/ca.crt"
-    - "{{ kube_cert_dir }}/ca.key"
-    - "{{ kube_cert_dir }}/front-proxy-ca.crt"
-    - "{{ kube_cert_dir }}/front-proxy-ca.key"
-    - "{{ kube_cert_dir }}/front-proxy-client.crt"
-    - "{{ kube_cert_dir }}/front-proxy-client.key"
-    - "{{ kube_cert_dir }}/sa.key"
-    - "{{ kube_cert_dir }}/sa.pub"
-  register: kubeadm_certs
-  delegate_to: "{{ groups['kube-master']|first }}"
-
-- name: kubeadm | write out kubeadm certs
-  copy:
-    dest: "{{ item.item }}"
-    content: "{{ item.content | b64decode }}"
-    owner: root
-    group: root
-    mode: 0600
-  no_log: true
-  register: copy_kubeadm_certs
-  with_items: "{{ kubeadm_certs.results }}"
-  when: inventory_hostname != groups['kube-master']|first
-
-- name: kubeadm | Init other uninitialized masters
-  command: timeout -k 600s 600s {{ bin_dir }}/kubeadm init --config={{ kube_config_dir }}/kubeadm-config.yaml --ignore-preflight-errors=all
-  register: kubeadm_init
-  retries: 10
-  until: kubeadm_init is succeeded or "field is immutable" in kubeadm_init.stderr
-  when:
-    - inventory_hostname != groups['kube-master']|first
-    - not kubeadm_already_run.stat.exists
-  failed_when: kubeadm_init.rc != 0 and "field is immutable" not in kubeadm_init.stderr
-  environment:
-    PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}"
-  notify: Master | restart kubelet