[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
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 Reporter:  teor          |          Owner:  teor
     Type:  defect        |         Status:  assigned
 Priority:  Medium        |      Milestone:  Tor: 0.4.3.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  043-should    |  Actual Points:
Parent ID:                |         Points:  1
 Reviewer:                |        Sponsor:
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Comment (by teor):

 This stem test passes on 0.4.2:
 * https://travis-ci.org/torproject/tor/jobs/637709536

 But fails on master:
 Stem logs:
 * https://travis-ci.org/teor2345/tor/builds/639735548#L5757
 Tor logs:
 * https://travis-ci.org/teor2345/tor/builds/639735548#L4708
 (I think the Tor logs are too verbose to show anything interesting.)

 So it's probably a Tor bug.

 I can also reproduce these results locally with the latest tor and stem
 master, so I should be able to bisect.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33006#comment:2>
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