Set permissions and owner on virtual mail domains

Without the owner being set to vmail and dovecot, when a virtual user
tries to access their mail account, dovecot throws an error that it does
not have permission to create the mail folder for the user.

With the owner and permissions being set the user's mail directory is
created and they can successfully sign in.

roles/mailserver/tasks/dovecot.yml

   file: state=directory path=/decrypted/${item.name}/${item.primary_user} owner=vmail group=dovecot
   with_items:
     - ${mail_virtual_domains}
+  file: state=directory path=/decrypted/${item.name} owner=vmail group=dovecot mode=770
+  with_items:
+    - ${mail_virtual_domains}
 
 - name: Copy dovecot.conf into place
   copy: src=etc_dovecot_dovecot.conf dest=/etc/dovecot/dovecot.conf