Add control port trace logging to tor
To diagnose #30235 (closed), we need to be able to see what tor is sending and receiving on the control port.
I don't think that tor has any logging code for control port messages: I had a quick look, and there wasn't anything obvious.
Showing each message at info level could be good, but it might also be risky? Maybe we should safe_string_client() the actual message text.
nickm and catalyst are refactoring the controller code right now, so they might know where I should add the logging statements.
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