privsep utilities collection

 Several small userv services, which allow certain system configuration
 actions to be delegated. In each case the service is disabled unless
 enabled by symlink /etc/userv/services.d/* -> ../services-available/*.
 .
 ipif - allow non-root users to create network interfaces
 ucgi - run CGI programs in providing user's account
 mailq - allow users to view the mail queue
 ndc-reload - allow certain users to reload the nameserver
 checkpasswd-* - allow users to run a UNIX password check
 groupmanage - allow users to create and manage a few groups each