Files in /etc/sudoers.d/ should be owned by root

Set owner and group to root when calling Ansible copy
module to create /etc/sudoers.d/{{ tripleo_admin_user }}
in tripleo_create_admin role.

Change-Id: I9efc5c5fd53ac89710bb9c5f4721f6afb55d8e3c
Closes-Bug: #1971498
(cherry picked from commit 0c63117897)

tripleo_ansible/roles/tripleo_create_admin/tasks/create_user.yml

@@ -26,6 +26,8 @@
     content: |
       {{ tripleo_admin_user }} ALL=(ALL) NOPASSWD:ALL
     mode: 0440
+    owner: root
+    group: root
 
 # workaround for https://bugs.launchpad.net/tripleo/+bug/1917856
 - name: ensure home dir has the right owner/group for user {{ tripleo_admin_user }}