Do positive DNS tests
<armadev> yep. do we do some 'positive' dns tests too? that is, if we can't resolve google or cnn or akamai, maybe we can't resolve anything. <armadev> mikeperry found some relays that can't resolve anything Maybe we should add some more tests to see if some well-known sites can be resolved. Also, we should probably wait with publishing the descriptor until DNS tests have run. [Automatically added by flyspray2trac: Operating System: All]
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