add support to create mailing lists

tasks/main.yml

@@ -53,3 +53,9 @@
 
 - name: flush handlers to get mailman ready
   meta: flush_handlers
+
+- name: setup mailing lists
+  include_tasks: list.yml
+  loop: "{{ mailman.lists.keys()|list }}"
+  loop_control:
+    loop_var: listname