[tor-bugs] #20012 [Core Tor/Tor]: Stop upgrading client to intro connections to ntor

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#20012: Stop upgrading client to intro connections to ntor
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     Reporter:  teor          |      Owner:  teor
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-hs
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 Split off from #19163, placed in the same milestone.

 Clients inadvertently upgrade to ntor when the hidden service descriptor
 does not have a TAP onion key. This is a client discriminator that can be
 used by hidden services to discover which consensus a client has.

 This bug was inadvertently introduced along with ntor in 0.2.4.8-alpha.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20012>
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