[tor-bugs] #33640 [Core Tor/Tor]: Add PATH_BIAS_TESTING purpose to specs

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#33640: Add PATH_BIAS_TESTING purpose to specs
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     Reporter:  gk            |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-spec
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Similar to #33639 I found
 {{{
 2020-03-17 21:26:35,977 stem [INFO] CIRC event had an unrecognized purpose
 (PATH_BIAS_TESTING). Maybe a new addition to the control protocol? Full
 Event: 'CIRC 322 CLOSED
 $8E915C44FD55A433CCAFACF4902BF1B2B16DD36C~snap277,$ECE90C4159D916921F7C8DDF4D088AC3808C521D~piss
 PURPOSE=PATH_BIAS_TESTING TIME_CREATED=2020-03-17T20:26:15.358481
 REASON=FINISHED'
 }}}
 in my `stem` logs and it seems `PATH_BIAS_TESTING` needs to get added to
 the specs as a "new" `PURPOSE` so `stem` can pick this up, too.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33640>
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