[tor-bugs] #21460 [Core Tor/Fallback Scripts]: Fallback script check_existing mode ignores IPv6 addresses added to the whitelist

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#21460: Fallback script check_existing mode ignores IPv6 addresses added to the
whitelist
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     Reporter:  teor                       |      Owner:  teor
         Type:  defect                     |     Status:  new
     Priority:  Medium                     |  Milestone:
    Component:  Core Tor/Fallback Scripts  |    Version:
     Severity:  Normal                     |   Keywords:
Actual Points:                             |  Parent ID:
       Points:                             |   Reviewer:
      Sponsor:                             |
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 I added an IPv6 address to the whitelist entry for a relay that was on the
 hard-coded fallback list.

 But since check_existing mode only checks the hard-coded list, it still
 showed up as a new address the next time the hard-coded list was run with
 check_existing mode.

 We could special-case this, or just re-add relays manually if this happens
 (it's pretty rare), or let them drop out and be added when we next rebuild
 the entire list.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21460>
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