Minor refactor of mailhost.pp
Minor refactor of mailhost.pp

* Remove what looks like copy-n-pasted lines (copied from resource/server.pp ?)
* Use `Stdlib::Port` instead of `Integer`
* Get rid of unneeded `+ 0` (which was needed to cast String's to
Integers)

voxpupuli/puppet-nginx,voxpupuli/puppet-nginx,jfryman/puppet-nginx,jfryman/puppet-nginx