[tor-bugs] #22759 [Core Tor/Fallback Scripts]: Mark the fallbacks that have extra-info descriptors, so stem can use them

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#22759: Mark the fallbacks that have extra-info descriptors, so stem can use them
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     Reporter:  teor                 |      Owner:  teor
         Type:  enhancement          |     Status:  new
     Priority:  Medium               |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Fallback    |    Version:
  Scripts                            |   Keywords:  tor-dirauth, fallback-
     Severity:  Normal               |  directory, dos-resistance
Actual Points:                       |  Parent ID:
       Points:  0.5                  |   Reviewer:
      Sponsor:                       |
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 In #19129, atagar says:
 > For what it's worth stem's descriptor downloader *doesn't* use fallback
 directories because they lack extrainfo descriptors...
 >
 > https://gitweb.torproject.org/stem.git/commit/?id=758f632
 >
 > This is fine. Tor doesn't need it (nor does it need the DirPort).
 However, if you want the fallbacks to relieve DirAuth load from other
 sources such as stem then these are both issues.

 We could easily add a 'extrainfo=1' to each fallback that supported
 extrainfo at the time we chose them. Then teach tor to parse or ignore it,
 because at the time tor is fetching extra-infos, it has already
 bootstrapped and has an up-to-date list.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22759>
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