[tor-bugs] #12614 [Pluggable transport]: Design a good way to pass transport options to child PTs

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#12614: Design a good way to pass transport options to child PTs
---------------------------------+-------------------------------
 Reporter:  infinity0            |          Owner:  RushingWookie
     Type:  defect               |         Status:  new
 Priority:  normal               |      Milestone:
Component:  Pluggable transport  |        Version:
 Keywords:  fog                  |  Actual Points:
Parent ID:                       |         Points:
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 Client transports get their k=v options from the SOCKS parameters, which
 is given in the Bridge line. Server transports get their k=v options from
 ServerTransportOptions.

 We need to define ways for fog to pass these options down to the relevant
 child.

 For example, one basic syntax would be, if fog receives an option of the
 form "fog-child-n-k=v", it passes "k=v" as the option (either SOCKS or
 ServerTransportOptions) down to the nth child PT in the chain. (This may
 not be the best idea; the consequences should be examine before we commit
 to this.)

 This must be documented as a public API of fog.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12614>
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