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Misc clarifications around CONNECTED and BEGIN behavior

Nick Mathewson requested to merge nickm/torspec:rend_connected_empty into main

Namely:

  • CONNECTED messages may be empty.
  • CONNECTED messages from onion services should be empty.
  • It is a bad idea to cache IP addresses you get from an exit.
  • END(DONE) is for the case where we reject a BEGIN without destroying the circuit.

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