Mailman: don't use postgresql_privs, it's buggy

See: https://github.com/ansible/ansible/issues/4043

playbooks/groups/mailman.yml

@@ -85,9 +85,16 @@
         - hyperkitty
         - kittystore
         - postorius
+#    - name: database users permissions
+#      postgresql_privs: database=$item role=${item}app type=database
+#                        priv=SELECT,INSERT,UPDATE,DELETE
+#      with_items:
+#        - hyperkitty
+#        - kittystore
+#        - postorius
     - name: database users permissions
-      postgresql_privs: database=$item role=${item}app type=database
+      postgresql_user: name=${item}app db=$item
-                        priv="SELECT,INSERT,UPDATE,DELETE"
+                       priv=SELECT,INSERT,UPDATE,DELETE
       with_items:
         - hyperkitty
         - kittystore