[tbb-bugs] #20837 [Applications/Tor Browser]: Turn on client iat-mode for some default obfs4 bridges

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#20837: Turn on client iat-mode for some default obfs4 bridges
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     Reporter:  dcf                       |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-bridges
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Since the last release, some of the default bridges have turned on obfs4's
 packet size and timing obfuscation (`iat-mode`). Here is the thread where
 it came up:
   [tor-project] Turning on timing obfuscation (iat-mode=1) for some
 default bridges
   https://lists.torproject.org/pipermail/tor-
 project/2016-November/000776.html

 We should make the client setting of `iat-mode` match the server setting.
 (If the two sides do not have the same setting, the connection will still
 work, but only one direction will be using the packet size and timing
 obfuscation.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20837>
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