dns/master: Rewrite create zone directories using loop

roles/dns/master/tasks/main.yml

@@ -1,12 +1,14 @@
 ---
 
-- name: Create zone directory
+- name: Create zone directories
   file:
-    path: "{{ domain_directory }}"
+    path: "{{ item }}"
     state: directory
     owner: root
     group: root
     mode: "u=rwx,g=rx"
+  loop:
+    - "{{ domain_directory }}"
 
 - name: Determine if keys are generated already
   find: