admin-users: new kitchen driver to test

By default, Docker doesn't have a proper SSH server,
so we can't test actions through systemd.
Those settings should be tested to see if they fix the issue.

admin-users/.z_kitchen.yml

@@ -3,6 +3,9 @@ driver:
   name: docker
   privileged: true
   use_sudo: false
+  # provision_command:
+  #   - /usr/bin/systemctl enable sshd
+  # run_command: /usr/sbin/init
 
 provisioner:
   name: ansible_playbook