[metrics-bugs] #33758 [Metrics/Consensus Health]: Fix exitmap related bad relay tests

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#33758: Fix exitmap related bad relay tests
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     Reporter:  gk                   |      Owner:  gk
         Type:  defect               |     Status:  assigned
     Priority:  Medium               |  Milestone:
    Component:  Metrics/Consensus    |    Version:
  Health                             |   Keywords:  network-health,
     Severity:  Normal               |  network-health-roadmap-2020Q1
Actual Points:                       |  Parent ID:  #33180
       Points:  1                    |   Reviewer:
      Sponsor:                       |
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 This ticket is a placeholder for going over other exitmap related tests
 (for `checktest.py` see #33663) and document them while we are at it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33758>
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