bridges fail on Tor 0.3.4.1-alpha and later
When I run the chutney bridges-min and bridges+ipv6-min tests on my mac, they fail on every release from 0.3.4.1-alpha through to master (837f11a532). But they succeed on maint-0.3.3, maint-0.3.2, and maint-0.2.9.