[metrics-bugs] #6946 [Metrics/Onionoo]: Allow filtering relays by OS

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#6946: Allow filtering relays by OS
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 Reporter:  rransom          |          Owner:  irl
     Type:  enhancement      |         Status:  needs_review
 Priority:  Medium           |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:  karsten          |        Sponsor:
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Changes (by irl):

 * status:  needs_revision => needs_review


Comment:

 New tests in a
 [[https://gitweb.torproject.org/user/irl/onionoo.git/commit/?h=task/6946|fixup
 commit]], along with a fix that the tests caught, proving the value of
 tests.

 I've also fixed all checkstyle complaints.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6946#comment:17>
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