SingleOnion (and Tor2web?) connections may need better expiry, lots left open

This is a followup to #24991 (moved), which has two of the config files (tor config, and tor log)

Expanding on the description in #24991 (moved), my blog has a low traffic single onion - barely gets hit over Tor at all - yet when I investigated it recently I found it claiming to have 6 circuits open for an extended period (days) and also ~50 simultaneous TCP connections.

I confirmed this with netstat, and then by killing the Tor daemon which threw all the connections into simultaneous TIME_WAIT.

I mentioned this to Teor on IRC, who suggested that I log " a ticket about expiring single onion and tor2web connections, please" - because this seems really strange, and suggests that SingleOnions are not garbage-collecting properly.