foreman dhcp params fix

gistfile1.txt

 class dhcp::params {

   $dhcp_dir = $operatingsystem ? {
     Ubuntu        => "/etc/dhcp",
     debian        => "/etc/dhcp",
     darwin        => "/opt/local/etc/dhcp",
     default       => "/etc",
   }

   $packagename = $operatingsystem ? {
     debian        => "dhcp3-server",
     darwin        => "dhcp", 
     Ubuntu        => "dhcp3-server",
     default       => "isc-dhcp-server",
   }

   $servicename = $operatingsystem ? {
     darwin        => "org.macports.dhcpd",
     Ubuntu        => "isc-dhcp-server",
     Debian        => "isc-dhcp-server",
     default       => "isc-dhcp-server",
   }

 }