[tor-bugs] #29364 [Obfuscation/meek]: Tone down [WARN] log messages resulting from meek-client output

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#29364: Tone down [WARN] log messages resulting from meek-client output
----------------------------------+-----------------
     Reporter:  dcf               |      Owner:  dcf
         Type:  enhancement       |     Status:  new
     Priority:  Medium            |  Milestone:
    Component:  Obfuscation/meek  |    Version:
     Severity:  Minor             |   Keywords:
Actual Points:                    |  Parent ID:
       Points:                    |   Reviewer:
      Sponsor:                    |
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 Since #28179, tor logs any output from managed proxies' stderr at the WARN
 level. So meek-client's log messages like
 {{{
 2019/02/07 08:12:22 listening on 127.0.0.1:39071
 }}}
 that formerly went into a black hole, now get logged by tor as
 {{{
 2/7/19, 08:12:22.657 [WARN] Managed proxy at
 './TorBrowser/Tor/PluggableTransports/meek-client' reported: 2019/02/07
 08:12:22 listening on 127.0.0.1:39071
 }}}

 The only real problem here is one of user interface. Being logged at WARN
 level causes the ⚠️ to pop up in Tor Launcher, when this is not something
 that requires user attention at all.

 May affect other transports.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29364>
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