Replace kube-master with kube_control_plane (#7256)

This replaces kube-master with kube_control_plane because of [1]:

  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". This means it should be removed from source code,
  documentation, and user-facing configuration from Kubernetes and
  its sub-projects.

NOTE: The reason why this changes it to kube_control_plane not
      kube-control-plane is for valid group names on ansible.

[1]: https://github.com/kubernetes/enhancements/blob/master/keps/sig-cluster-lifecycle/kubeadm/2067-rename-master-label-taint/README.md#motivation

roles/kubernetes-apps/external_provisioner/cephfs_provisioner/tasks/main.yml

@@ -5,7 +5,7 @@
     path: "{{ kube_config_dir }}/addons/cephfs_provisioner"
     state: absent
   when:
-    - inventory_hostname == groups['kube-master'][0]
+    - inventory_hostname == groups['kube_control_plane'][0]
   tags:
     - upgrade
 
@@ -14,7 +14,7 @@
     {{ bin_dir }}/kubectl delete namespace {{ cephfs_provisioner_namespace }}
   ignore_errors: yes
   when:
-    - inventory_hostname == groups['kube-master'][0]
+    - inventory_hostname == groups['kube_control_plane'][0]
   tags:
     - upgrade
 
@@ -23,7 +23,7 @@
     {{ bin_dir }}/kubectl delete storageclass {{ cephfs_provisioner_storage_class }}
   ignore_errors: yes
   when:
-    - inventory_hostname == groups['kube-master'][0]
+    - inventory_hostname == groups['kube_control_plane'][0]
   tags:
     - upgrade
 
@@ -35,7 +35,7 @@
     group: root
     mode: 0755
   when:
-    - inventory_hostname == groups['kube-master'][0]
+    - inventory_hostname == groups['kube_control_plane'][0]
 
 - name: CephFS Provisioner | Templates list
   set_fact:
@@ -65,7 +65,7 @@
     dest: "{{ kube_config_dir }}/addons/cephfs_provisioner/{{ item.file }}"
   with_items: "{{ cephfs_provisioner_templates }}"
   register: cephfs_provisioner_manifests
-  when: inventory_hostname == groups['kube-master'][0]
+  when: inventory_hostname == groups['kube_control_plane'][0]
 
 - name: CephFS Provisioner | Apply manifests
   kube:
@@ -76,4 +76,4 @@
     filename: "{{ kube_config_dir }}/addons/cephfs_provisioner/{{ item.item.file }}"
     state: "latest"
   with_items: "{{ cephfs_provisioner_manifests.results }}"
-  when: inventory_hostname == groups['kube-master'][0]
+  when: inventory_hostname == groups['kube_control_plane'][0]