[tor-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
-----------------------------------------------+---------------------------
 Reporter:  dcf                                |          Owner:  tbb-team
     Type:  task                               |         Status:
                                               |  needs_review
 Priority:  Medium                             |      Milestone:
Component:  Applications/Tor Browser           |        Version:
 Severity:  Normal                             |     Resolution:
 Keywords:  tbb-bridges TorBrowserTeam201611R  |  Actual Points:
Parent ID:                                     |         Points:
 Reviewer:                                     |        Sponsor:
-----------------------------------------------+---------------------------
Changes (by dcf):

 * keywords:  tbb-bridges => tbb-bridges TorBrowserTeam201611R
 * status:  new => needs_review


Comment:

 This patch makes the following changes:
  * ndnop3 → `iat-mode=1`
  * ndnop5 → `iat-mode=2`
  * Lisbeth → `iat-mode=1`

 The change in settings for ndnop3 and ndnop5 was reported by Linus here:
 https://lists.torproject.org/pipermail/tor-
 project/2016-November/000780.html.

 The change in settings for Lisbeth was told me on IRC by dgoulet.

 I tested this patch by commenting all the bridges in a fresh download of
 Tor Browser 6.0.6, then adding each of the changed bridge lines one at a
 time and verifying that I could bootstrap.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20837#comment:1>
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