[arch-releng] Torrent tracker

So I setup (with the help of Pierre) a torrent tracker on sigurd, located at tracker.archlinux.org Pierre has pointed his tracker DNS to ours, so it should be our single tracker now. It is setup with a whitelist, so an admin needs to add the torrent hash if new additions are necessary. The torrent hash can be sniffed from a torrent file using `transmissioncli -i FILENAME` As of right now it's tracking whatever the archlinux.de tracker had (archboot ISOs mostly) and the official RC1 ISOs. Let me know if you have any questions or issues. - Aaron PS I'm seeding the RC1 ISOs from home