Demote “No current certificate known for authority” log messages to level info
Currently, Tor emits log messages like:
No current certificate known for authority tor26; launching request.at notice level under certain conditions. This leads users to send useless bug reports that only mention the “No current certificate known” message (and usually they even misquote that message).
We should demote this message to level ‘info’. That way, users will have a slightly harder time finding a non-problem to quote in their support requests instead of the log messages that will actually let us diagnose the problem.