tor/changes/bug21394

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o Major bugfixes (Exit nodes):
- Fix an issue causing high-bandwidth exit nodes to fail a majority
or all of their DNS requests, making them basically unsuitable for
regular usage in Tor circuits. The problem is related to
libevent's DNS handling, but we can work around it in Tor. Fixes
bugs 21394 and 18580; bugfix on 0.1.2.2-alpha which introduced
eventdns. Credit goes to Dhalgren for identifying and finding a
workaround to this bug and to gamambel, arthuredelstein and
arma in helping to track it down and analyze it.