dns/master: Create keys directory writeable for bind

To apply KASP later

roles/dns/master/tasks/main.yml

@@ -17,11 +17,11 @@
     group: "{{ dns_user }}"
     mode: u=rwx,g=rx,o=
 
-- name: Create key directory readable for bind
+- name: Create key directory
   file:
     path: "{{ keys_directory }}"
     state: directory
-    owner: root
+    owner: "{{ dns_user }}"
     group: "{{ dns_user }}"
     mode: u=rwx,g=rx,o=