Implement graceful shutdown of tracker.
Implement graceful shutdown of tracker.

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