[tor-bugs] #19022 [Core Tor/Tor]: Extract intro_nodes status tracking from rend_service_descriptor_t

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#19022: Extract intro_nodes status tracking from rend_service_descriptor_t
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     Reporter:  arma          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:  SponsorR-can  |
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 To make the rend_service_descriptor_t struct closer to immutatable, we
 should fix the behavior in validate_intro_point_failure() where we delete
 entries from desc->intro_nodes that are in the failure cache.

 Maybe a good fix is to move the whole status tracking of the intro point
 fetches into the rend failure cache, rather than having some of the status
 tracking in each place.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19022>
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