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/csi_driver/gcp_pd/tasks/main.yml

@@ -11,14 +11,14 @@
     dest: "{{ kube_config_dir }}/cloud-sa.json"
     group: "{{ kube_cert_group }}"
     mode: 0640
-  when: inventory_hostname == groups['kube-master'][0]
+  when: inventory_hostname == groups['kube_control_plane'][0]
   tags: gcp-pd-csi-driver
 
 - name: GCP PD CSI Driver | Get base64 cloud-sa.json
   slurp:
     src: "{{ kube_config_dir }}/cloud-sa.json"
   register: gcp_cred_secret
-  when: inventory_hostname == groups['kube-master'][0]
+  when: inventory_hostname == groups['kube_control_plane'][0]
   tags: gcp-pd-csi-driver
 
 - name: GCP PD CSI Driver | Generate Manifests
@@ -31,7 +31,7 @@
     - {name: gcp-pd-csi-controller, file: gcp-pd-csi-controller.yml}
     - {name: gcp-pd-csi-node, file: gcp-pd-csi-node.yml}
   register: gcp_pd_csi_manifests
-  when: inventory_hostname == groups['kube-master'][0]
+  when: inventory_hostname == groups['kube_control_plane'][0]
   tags: gcp-pd-csi-driver
 
 - name: GCP PD CSI Driver | Apply Manifests
@@ -42,7 +42,7 @@
   with_items:
     - "{{ gcp_pd_csi_manifests.results }}"
   when:
-    - inventory_hostname == groups['kube-master'][0]
+    - inventory_hostname == groups['kube_control_plane'][0]
     - not item is skipped
   loop_control:
     label: "{{ item.item.file }}"