[tor-bugs] #30643 [Core Tor/sbws]: Add Travis CI jobs with stem 1.7.0 and stem master

[Tor Bug Tracker & Wiki]

#30643: Add Travis CI jobs with stem 1.7.0 and stem master
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     Reporter:  teor           |      Owner:  (none)
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:  sbws: 1.2.x-final
    Component:  Core Tor/sbws  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:  #30406
       Points:                 |   Reviewer:
      Sponsor:                 |
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 We need to make sure sbws works with the stable and master versions of
 stem.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30643>
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