[tor-bugs] #29763 [Core Tor/Chutney]: Fix 0.2.9 failures in chutney CI

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#29763: Fix 0.2.9 failures in chutney CI
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     Reporter:  teor              |      Owner:  teor
         Type:  defect            |     Status:  assigned
     Priority:  Medium            |  Milestone:
    Component:  Core Tor/Chutney  |    Version:
     Severity:  Normal            |   Keywords:  chutney-ci
Actual Points:                    |  Parent ID:  #29761
       Points:                    |   Reviewer:
      Sponsor:                    |
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 In #29761, we discovered that 0.2.9 often fails, and when one allow
 failures run fails, the next fails too.

 I want to add a sleep between allow failures rounds to hopefully allow
 0.2.9 to recover.

 Should we only add the sleep for 0.2.9?
 Probably, otherwise we won't notice regressions.

 We might also need to:
 * adjust the 0.2.9 bootstrap timings
 * remove 0.2.9 from CI

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29763>
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