[tor-bugs] #29369 [Metrics/Onionperf]: Fix message logging and filtering

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#29369: Fix message logging and filtering
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     Reporter:  irl                |      Owner:  hiro
         Type:  defect             |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 When running in measurement mode, new analysis results are produced every
 night at midnight utc. However, in cases when OnionPerf was not running at
 midnight and restarts on a later day, log messages from both partial days
 appear in the same log file. When the analysis is run at the midnight
 following the day it was restarted, downloads from the day it was first
 stopped may appear in the analysis results (the .tpf files).

 We should fix this.

     allow onionperf analysis mode to filter out log messages that do not
 match a certain date; onionperf measurement mode should take advantage of
 that feature
     When exporting Torperf .tpf files, and a date filter is applied, we
 need to ensure that we do not include downloads that started on a
 different day (to handle the case where it ended on the filtered date but
 started on the previous day)
     onionperf should name the log files according to the date of the log
 message timestamps, and each log message should only be appended to the
 file corresponding to that date

 (Copied from https://github.com/robgjansen/onionperf/issues/31)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29369>
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