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/container_engine_accelerator/nvidia_gpu/tasks/main.yml

@@ -38,7 +38,7 @@
     - { name: k8s-device-plugin-nvidia-daemonset, file: k8s-device-plugin-nvidia-daemonset.yml, type: daemonset }
   register: container_engine_accelerator_manifests
   when:
-    - inventory_hostname == groups['kube-master'][0] and nvidia_driver_install_container
+    - inventory_hostname == groups['kube_control_plane'][0] and nvidia_driver_install_container
 
 - name: Container Engine Acceleration Nvidia GPU | Apply manifests for nvidia accelerators
   kube:
@@ -51,4 +51,4 @@
   with_items:
     - "{{ container_engine_accelerator_manifests.results }}"
   when:
-    - inventory_hostname == groups['kube-master'][0] and nvidia_driver_install_container and nvidia_driver_install_supported
+    - inventory_hostname == groups['kube_control_plane'][0] and nvidia_driver_install_container and nvidia_driver_install_supported