[tor-bugs] #4620 [Tor Relay]: Move the prefer_ipv6 to node_t

[Tor Bug Tracker & Wiki]

#4620: Move the prefer_ipv6 to node_t
-----------------------+----------------------------------------------------
 Reporter:  ln5        |          Owner:     
     Type:  defect     |         Status:  new
 Priority:  minor      |      Milestone:     
Component:  Tor Relay  |        Version:     
 Keywords:  ipv6       |         Parent:     
   Points:             |   Actualpoints:     
-----------------------+----------------------------------------------------
 The prefer_ipv6 flag in routerinfo_t should not be there since that data
 structure is supposed to be immutable.  Move it to node_t.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4620>
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