Too much log when using obfs4 in Tails

Originally created by @sajolida on #15743 (Redmine)

From Cybelle’s report: https://lists.torproject.org/pipermail/tor-project/2018-July/001871.html

Tails 3.7 Debug or a high level of logging still present in /var/log/tor/log - when using obf4 (or whatever) bridges. This is a reminder that this problem continues to exist in Tails 3.7 (and several versions prior). The logging is crazy and consumes several MB per session. “warn Your log may contain sensitive information - you’re logging more than ”notice". Don’t log unless it serves an important reason. Overwrite the log afterwards.

I think we should check that…

Feature Branch: bugfix/15743-tor-log-level-with-bridges+force-all-tests

Related issues

• Related to #15548 (closed)
• Blocks tails/accounting#15507