[tor-bugs] #14332 [Core Tor/Chutney]: Use new string formatting interface

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#14332: Use new string formatting interface
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 Reporter:  cypherpunks       |          Owner:  cypherpunks
     Type:  defect            |         Status:  needs_revision
 Priority:  Medium            |      Milestone:
Component:  Core Tor/Chutney  |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:                    |  Actual Points:
Parent ID:                    |         Points:
 Reviewer:                    |        Sponsor:
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Comment (by teor):

 We need to make this change in 2019, because python 2's end of life is
 2020.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14332#comment:12>
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