[tor-bugs] #17889 [Tor]: Make ClientPreferIPv6ORPort apply to bridge clients

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#17889: Make ClientPreferIPv6ORPort apply to bridge clients
-----------------------------+--------------------------------
     Reporter:  teor         |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor          |    Version:
     Severity:  Normal       |   Keywords:  ipv6 bridges
Actual Points:               |  Parent ID:  #17811
       Points:               |    Sponsor:
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 After #17840, clients that don't use bridges will select ORPorts using
 ClientPreferIPv6ORPort.

 We could do this for bridges as well, by modifying the new function
 fascist_firewall_choose_address_base:
 * use ClientPreferIPv6ORPort to choose a preferred address for bridge
 clients,
 * but ignore the "preferred address only setting", so that bridge users
 always get an address if there is one available.

 I don't want to do this as part of #17840, because I'm not sure if it's
 really necessary - bridges just seem to work ok as-is.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17889>
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