Improve webrtc peer connection handling

[feross]

• need to cleanup closed/errored webrtc peers from the swarm
• need to cleanup unused peers when tracker doesn't respond any answers (add a timeout)
• need to increase number of offers (maybe to 25?)
• need to re-announce to tracker every 5 minutes (instead of 15 minutes) since peers are probably shorter-lived

[feross]

I just pushed an improvement to the tracker module, so we now try to look for new peers every 30 seconds on the already-established WebSocket connection to the tracker.

[DiegoRBaquero]

@feross The first two, I think they can be checked with the recent peer destroy update.

[feross]

@DiegoRBaquero Yep, thanks. Going to close this now.

[lock]

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