[metrics-bugs] #34316 [Metrics/Onionperf]: Make -o/-i arguments mutually exclusive

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#34316: Make -o/-i arguments mutually exclusive
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     Reporter:  karsten            |      Owner:  karsten
         Type:  defect             |     Status:  assigned
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:  0.2                |   Reviewer:
      Sponsor:  Sponsor59          |
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 Right now, it's possible to specify both `-o` and `-i` at the same time,
 which doesn't make any sense.

 Also, it's rather non-intuitive that both argument defaults are `True` and
 that setting either of them changes their value to `False`.

 I found this issue while working on #34216, but this issue seemed
 sufficiently different to justify having its own ticket. I'll post a patch
 for review in a minute.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34316>
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