[tor-bugs] #16952 [Tor]: Retry configure/verify on transient chutney failures

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#16952: Retry configure/verify on transient chutney failures
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:  nickm
         Type:  defect   |     Status:  needs_review
     Priority:  normal   |  Milestone:
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:  Post027Freeze TorCoreTeam201509
Actual Points:           |  testing SponsorS
       Points:           |  Parent ID:  #16953
-------------------------+-------------------------------------------------

Comment (by teor):

 Updated the `retry-test-network-on-failure` branch to retry configuration
 on chutney verify failure. (It previously only retried on chutney
 configure failure.)
 Also added further comments and fixed up a trailing space.

 The script now runs for a maximum of approximately 3 minutes per test
 network (2 x 60 seconds MAX_BOOSTRAP + 2 x 8 x 3-4 seconds chutney verify
 run time / network timeout).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16952#comment:3>
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