Harold: uTorrent uses the nodes key for backup DHT bootstrapping information
incase other "more primary" information fails
It sould be made configurable with different servers.
There is documentation at http://www.bittorrent.org/beps/bep_0005.html that
suggests that nodes keys should be added only for trackerless torrents, but Harold
said that information is outdated since the core change (BitTorrent.com switched
to the uTorrent core).
Note: remove source code comment in mod_mirrorbrain.c about this.