[tor-bugs] #4620 [Tor Relay]: Move ipv6_preferred from routerinfo_t to node_t

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#4620: Move ipv6_preferred from routerinfo_t to node_t
-----------------------+----------------------------------------------------
 Reporter:  ln5        |          Owner:  ln5               
     Type:  defect     |         Status:  assigned          
 Priority:  minor      |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Relay  |        Version:                    
 Keywords:  ipv6       |         Parent:                    
   Points:             |   Actualpoints:                    
-----------------------+----------------------------------------------------

Comment(by nickm):

 Whenever we have a routerinfo_t in the routerlist, there should be a
 node_t for it.  That's one of the things that the routerinfo_* maintenance
 functions handle (by calling nodelist_add_routerinfo).

 That said, I'm fine with letting this wait for 0.2.4.x if you think it's
 safer that way.  If you agree, feel free to change the milestone.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4620#comment:5>
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