[tor-bugs] #17847 [Tor]: Unify router_pick_directory_server_impl and router_pick_trusteddirserver_impl

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#17847: Unify router_pick_directory_server_impl and
router_pick_trusteddirserver_impl
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     Reporter:  teor         |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:  Tor: 0.2.???
    Component:  Tor          |    Version:
     Severity:  Normal       |   Keywords:  easy refactor
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 router_pick_directory_server_impl and router_pick_trusteddirserver_impl
 are very similar.

 I wonder if we could refactor them into a single function?
 (Even if we have to use a macro to do it.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17847>
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