[tor-bugs] #32731 [Core Tor/Chutney]: Add __future__ imports to every chutney python file

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#32731: Add __future__ imports to every chutney python file
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     Reporter:  teor              |      Owner:  teor
         Type:  task              |     Status:  assigned
     Priority:  Medium            |  Milestone:
    Component:  Core Tor/Chutney  |    Version:
     Severity:  Normal            |   Keywords:
Actual Points:  0.1               |  Parent ID:
       Points:                    |   Reviewer:
      Sponsor:                    |
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 To make extra sure any changes to our python 2.7 code are compatible with
 python 3, we should add `__future__` imports to every chutney python file.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32731>
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