Adds support for webhook token auth. (#3939)

Webhook token auth:
https://kubernetes.io/docs/reference/access-authn-authz/authentication/#webhook-token-authentication

Fixes #3063.

roles/kubernetes/master/tasks/main.yml

@@ -7,6 +7,12 @@
   when:
     - kube_basic_auth|default(true)
 
+- name: Create webhook token auth config
+  template:
+    src: webhook-token-auth-config.yaml.j2
+    dest: "{{ kube_config_dir }}/webhook-token-auth-config.yaml"
+  when: kube_webhook_token_auth|default(false)
+
 - import_tasks: encrypt-at-rest.yml
   when:
     - kube_encrypt_secret_data