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

contrib/terraform/exoscale/templates/inventory.tpl

@@ -2,10 +2,10 @@
 ${connection_strings_master}
 ${connection_strings_worker}
 
-[kube-master]
+[kube_control_plane]
 ${list_master}
 
-[kube-master:vars]
+[kube_control_plane:vars]
 supplementary_addresses_in_ssl_keys = [ "${api_lb_ip_address}" ]
 
 [etcd]
@@ -15,5 +15,5 @@ ${list_master}
 ${list_worker}
 
 [k8s-cluster:children]
-kube-master
+kube_control_plane
 kube-node