[tor-bugs] #19755 [Metrics/CollecTor]: improve code quality of bridgedescs module

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#19755: improve code quality of bridgedescs module
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 Reporter:  iwakeh             |          Owner:  iwakeh
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:  CollecTor 1.2.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by karsten):

 Alright, I cleaned up my earlier task-19755 branch by rebasing it to
 master and rewriting Git history to make more sense.  Please review my
 [https://gitweb.torproject.org/karsten/metrics-db.git/log/?h=task-19755-2
 task-19755-2 branch].  (Note that I did ''not'' put in the binary literals
 suggested on #19317, because that confuses Cobertura.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19755#comment:19>
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