[tor-bugs] #17845 [Tor]: Add unit tests for IPv6 relay descriptors

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#17845: Add unit tests for IPv6 relay descriptors
-----------------------------+--------------------------------
     Reporter:  teor         |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor          |    Version:
     Severity:  Normal       |   Keywords:  ipv6
Actual Points:               |  Parent ID:  #17811
       Points:               |    Sponsor:
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 Once chutney can verify using relays on IPv6 (#17011/#17153), we should
 update the unit tests to use descriptors that contain IPv6 addresses in
 "or-address" lines.

 This will allow us to unit test #17840 and various other tickets.

 From #17840:
 * nodelist_set_consensus: setting ipv6_preferred correctly based on
 ClientUseIPv6, ClientPreferIPv6ORPort, and ClientUseIPv4.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17845>
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