updated init.pp to take in a custom path for denyhosts cfg/conf file

updated denyhosts to take a custom path of where denyhosts.conf can live.

Repoforge's denyhosts config file lives in /etc/denyhosts/denyhosts.cfg. I made this small modification so I can specify an alternate path to ensure the denyhosts file to the same place /etc/denyhosts/denyhosts.cfg vs what is hard configured in /etc/denyhosts.conf.

cheers!