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use consensus ip:port for dir auths if different

Roger Dingledine requested to merge arma/tor:ticket40705 into main

Directory authorities and relays now interact properly with directory authorities if they change addresses. In the past, they would continue to upload votes, signatures, descriptors, etc to the hard-coded address in the configuration. Now, if the directory authority is listed in the consensus at a different address, they will direct queries to this new address.

Specifically, these three activities have changed:

  • Posting a vote, a signature, or a relay descriptor to all the dir auths.

  • Dir auths fetching missing votes or signatures from all the dir auths.

  • Dir auths fetching new descriptors from a specific dir auth when they just learned about them from that dir auth's vote.

We already do this desired behavior (prefer the address in the consensus, but fall back to the hard-coded dirservers info if needed) when fetching missing certs.

There is a fifth case, in router_pick_trusteddirserver(), where clients and relays are trying to reach a random dir auth to fetch something. I left that case alone for now because the interaction with fallbackdirs is complicated.

Implements ticket 40705.

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