Metadata fixes: Go trackerless earlier, and ignore unnecessary metadata.
Metadata fixes: Go trackerless earlier, and ignore unnecessary metadata.

Make the change over to trackerlessmode closer to when TorrentSession is
created. This prevents trackerClient from starting up for magnet links
that don't have trackers.

Also, ignore any metadata data we receive if the torrent is already
loaded.

Dataman-Cloud/Taipei-Torrent,FlexibleBroadband/Taipei-Torrent,FlexibleBroadband/Taipei-Torrent,ansonwzj/CPSC416Taipei,ansonwzj/CPSC416Taipei,Dataman-Cloud/Taipei-Torrent,beni55/Taipei-Torrent,beni55/Taipei-Torrent