[tor-bugs] #20797 [Metrics/Torflow]: Exclude authorities from bandwidth scanning

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#20797: Exclude authorities from bandwidth scanning
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     Reporter:  teor             |      Owner:  aagbsn
         Type:  defect           |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Torflow  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 The bandwidth authorities scan the bandwidth of the directory authorities,
 and then skip them when aggregating bandwidth for votes:
 https://gitweb.torproject.org/torflow.git/tree/NetworkScanners/BwAuthority/aggregate.py#n755

 It would save directory authority bandwidth to skip them at the scanning
 stage instead.

 We could do this by adding 'Authority' to the forbidden flags for entry,
 middle, and exit nodes here:
 https://gitweb.torproject.org/pytorctl.git/tree/PathSupport.py#n1151

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20797>
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