Various updates

* add modules/ prefix to the init.d file resource: This is according to http://docs.puppetlabs.com/references/latest/type.html#file-attribute-source This didn't work on Puppet 3.4+ without it.
* db_users does not exist in the config context: This change grabs the passed parameters from init.pp
* Add the '+' symbol to the version regular expression: When getting pgbouncer from postgres (
http://apt.postgresql.org/pub/repos/apt/pool/main/p/pgbouncer/ ) there
is a '+' in the version. Kwalify failed before this regex was updated.