[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 iwakeh):

 Thanks for all these tests!

 Now we have a basis for the refactoring of this module.

 It seemed shorter to write the code for the suggestions I had.
 Please, see the seven commits in
 [https://gitweb.torproject.org/user/iwakeh/collector.git?h=task-19755-2 my
 branch] based on yours.

 Cobertura barks on binary literals, but doesn't fail, so I would prefer to
 use them.

 I tried to make the commits independent of each other.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19755#comment:20>
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