Cleanup mailman manifest init.pp lint errors.
Cleanup mailman manifest init.pp lint errors.

Change-Id: I387b377d65fbbe49581fa85a371d214ad60e4552
Reviewed-on: https://review.openstack.org/14908
Reviewed-by: Paul Belanger <b4265d8fef626f73eff739ef4ffce9d45b30eddd@polybeacon.com>
Reviewed-by: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Approved: Clark Boylan <635fc31d01fa593720982fa0568e87170cedbe2c@gmail.com>
Reviewed-by: Clark Boylan <635fc31d01fa593720982fa0568e87170cedbe2c@gmail.com>
Tested-by: Jenkins

open-switch/infra_puppet-mailman,open-switch/infra_puppet-mailman,open-switch/infra_puppet-mailman