[tor-bugs] #20839 [Core Tor/Tor]: Stop rejecting NS descriptors when microdescs are the default

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#20839: Stop rejecting NS descriptors when microdescs are the default
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.3.2-alpha
     Severity:  Normal        |   Keywords:
Actual Points:  0.2           |  Parent ID:
       Points:  0.2           |   Reviewer:
      Sponsor:                |
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 When we merged #6769, it exposed a bug in router_get_routerlist(), which
 checks full router descriptors against the usable consensus flavour. This
 check fails for all downloaded descriptors when the usable flavour is
 microdescriptor.

 Directory servers were somewhat immune to this issue, because they still
 put the descriptors that failed this check in old_routers. But this still
 might have caused subtle bugs down the track.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20839>
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