[tor-bugs] #18922 [Metrics/CollecTor]: configure logging via properties file

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#18922: configure logging via properties file
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     Reporter:  iwakeh             |      Owner:  iwakeh
         Type:  defect             |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:  ctip
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 CollecTor's logging should be configured using a properties file, which
 could be reconfigured by operators as needed.

 The class LoggingConfiguration should be removed.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18922>
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