[tor-bugs] #30067 [Core Tor/sbws]: Update sbws' travis config, based on chutney's travis config

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#30067: Update sbws' travis config, based on chutney's travis config
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     Reporter:  teor           |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Core Tor/sbws  |    Version:
     Severity:  Normal         |   Keywords:  sbws-ci
Actual Points:                 |  Parent ID:  #29729
       Points:  1              |   Reviewer:
      Sponsor:                 |
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 Let's test all the python/tor things in similar ways.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30067>
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