added configuration for pureftpd versions greater than 1.0.50
added function get_host_ips() because gentoo does not provide IPs with "hostname --all-ip-addresses"
new config based on debian config
added because gentoo has no mod version installed by default
updated based on debian config
added gentoo specific code to keep symlinks as init script. gentoo uses symlinks to start different php-fpm versions, but "realpath" kills these symlinks.