[tor-bugs] #33006 [Core Tor/Tor]: Fix test-stem `test_take_ownership_via_controller` failure

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#33006: Fix test-stem `test_take_ownership_via_controller` failure
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:  teor
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.3.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  043-should
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 Stem's `test_take_ownership_via_controller` test fails when run in Travis
 CI. This is a recent failure, some time in the last month or two.

 See, for example:
 https://travis-ci.org/torproject/tor/jobs/639546796

 We're trying to work out if it's a Tor or Stem issue right now, here's the
 corresponding Stem ticket:
 https://github.com/torproject/stem/issues/52

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33006>
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