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.

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