[tor-bugs] #32699 [Core Tor/Fallback Scripts]: Rename the fallback input list to an "offer list"

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#32699: Rename the fallback input list to an "offer list"
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     Reporter:  teor                       |      Owner:  teor
         Type:  defect                     |     Status:  assigned
     Priority:  Medium                     |  Milestone:
    Component:  Core Tor/Fallback Scripts  |    Version:
     Severity:  Normal                     |   Keywords:  fallback
Actual Points:                             |  Parent ID:  #24839
       Points:  0.5                        |   Reviewer:
      Sponsor:                             |
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 In #24839, we want to replace the list of relay operators who have offered
 their relays as fallbacks, with signed statements in descriptors via a
 torrc option.

 As part of that transition, we should rename the internal variables in the
 script, and the file in the repository. I suggest we use "fallback offer
 list".

 We should also delete any remaining references to the blacklist, because
 it is obsolete, and the actual list was removed from the repository some
 time ago.

 This change also has the benefit of avoiding the "white = good" metaphor,
 which can be confusing and problematic. For more details, see:
 https://tools.ietf.org/id/draft-knodel-terminology-00.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32699>
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