Software Heritage preseeding configuration

./generate_preseed.py -n worker03 --private-mac 52:54:00:1a:85:9e --finish-url http://perso.ensta-paristech.fr/~dandrimont/finish.sh --preseed-template preseed.cfg.tpl --public-mac 52:54:00:be:26:34 --public-ip 128.93.193.23 --public-netmask 255.255.255.0 --public-gateway 128.93.193.254 --public-dns 193.51.196.130