[tor-bugs] #33745 [Circumvention/Snowflake]: Merge a turbotunnel branch

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#33745: Merge a turbotunnel branch
-----------------------------------------+-------------------------
     Reporter:  dcf                      |      Owner:  dcf
         Type:  task                     |     Status:  assigned
     Priority:  Medium                   |  Milestone:
    Component:  Circumvention/Snowflake  |    Version:
     Severity:  Normal                   |   Keywords:  turbotunnel
Actual Points:                           |  Parent ID:  #19001
       Points:                           |   Reviewer:
      Sponsor:                           |
-----------------------------------------+-------------------------
 Snowflake turbo tunnel features have now been through a test deployment
 (#33336) and a few iterations of Tor Browser packages. There haven't been
 as many test reports as I'd like, but what testing there has been has been
 mostly positive. Turbo tunnel–like features are a dependency of some of
 the tasks for a stable release of Snowflake (#19001). So we should merge
 it.

 Some sub-tasks:
 * Decide between the
 [https://gitweb.torproject.org/user/dcf/snowflake.git/log/?h=turbotunnel-
 kcp KCP] and [https://gitweb.torproject.org/user/dcf/snowflake.git/log/?h
 =turbotunnel-quic QUIC branch].
 * Test without `LearnCircuitBuildTimeout 0` and find another workaround,
 if necessary. See comment:15:ticket:33336.
 * Rebase and clean history of the chosen branch.
 * Redeploy bridge from master.

 Summary of turbo tunnel development history till now:
 * [https://lists.torproject.org/pipermail/anti-censorship-
 team/2020-February/000059.html Turbo Tunnel in Snowflake]
 * [https://lists.torproject.org/pipermail/anti-censorship-
 team/2020-February/000074.html Second draft of Turbo Tunnel Snowflake
 packages]
 * [https://lists.torproject.org/pipermail/anti-censorship-
 team/2020-March/000075.html Third draft of Turbo Tunnel Snowflake
 packages]
 * [[#33336|Trial deployment of Snowflake with Turbo Tunnel]]
 * [[#33519|Support multiple simultaneous SOCKS connections]]

 One bug that may or not be snowflake's fault:
 * [[#33669|"Pluggable Transport process terminated" but Tor keeps on going
 (and of course doesn't work)]]

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33745>
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