Review every use of onehop_tunnel for assumptions that it's a directory connection
Previously, the only onehop_tunnel connections Tor made were for directory fetches.
But now, with Tor2Web and Rendezvous Single Onion Services (and Single Onion Services, when they arrive), several other modes make one-hop connections.
We should check every use of onehop_tunnel to make sure it's not being used as a substitute for checking the purpose / type of the connection.
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