[tor-bugs] #26916 [Core Tor/Stem]: Make tox config more useful/friendly for running multiple interpreters/versions

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#26916: Make tox config more useful/friendly for running multiple
interpreters/versions
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     Reporter:  dmr            |      Owner:  dmr
         Type:  enhancement    |     Status:  assigned
     Priority:  Medium         |  Milestone:
    Component:  Core Tor/Stem  |    Version:
     Severity:  Normal         |   Keywords:  dev testing
Actual Points:                 |  Parent ID:
       Points:                 |   Reviewer:
      Sponsor:                 |
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 Right now `tox` can be a bit of a pain for dev usage.
 This ticket is intended to remove some of the hassle for multiple
 interpreters/versions, and make the default environments config a bit more
 useful.

 I've identified a few improvements under this theme - these are better
 described in commits.

 **atagar: I've got a PR coming soon**

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26916>
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