Move recover_control_plane/master to control-plane (#7236)

According to the following recommendation, this moves the directory
to control-plane:

The Kubernetes project is moving away from wording that is considered
offensive. A new working group WG Naming was created to track this work,
and the word "master" was declared as offensive. A proposal was formalized
for replacing the word "master" with "control plane".

roles/recover_control_plane/control-plane/defaults/main.yml

@@ -0,0 +1,2 @@
+---
+bin_dir: /usr/local/bin

roles/recover_control_plane/control-plane/tasks/main.yml

@@ -0,0 +1,29 @@
+---
+- name: Wait for apiserver
+  command: "{{ bin_dir }}/kubectl get nodes"
+  environment:
+    - KUBECONFIG: "{{ ansible_env.HOME | default('/root') }}/.kube/config"
+  register: apiserver_is_ready
+  until: apiserver_is_ready.rc == 0
+  retries: 6
+  delay: 10
+  changed_when: false
+  when: groups['broken_kube-master']
+
+- name: Delete broken kube-master nodes from cluster
+  command: "{{ bin_dir }}/kubectl delete node {{ item }}"
+  environment:
+    - KUBECONFIG: "{{ ansible_env.HOME | default('/root') }}/.kube/config"
+  with_items: "{{ groups['broken_kube-master'] }}"
+  register: delete_broken_kube_masters
+  failed_when: false
+  when: groups['broken_kube-master']
+
+- name: Fail if unable to delete broken kube-master nodes from cluster
+  fail:
+    msg: "Unable to delete broken kube-master node: {{ item.item }}"
+  loop: "{{ delete_broken_kube_masters.results }}"
+  changed_when: false
+  when:
+    - groups['broken_kube-master']
+    - "item.rc != 0 and not 'NotFound' in item.stderr"