[tor-bugs] #20918 [Core Tor/Tor]: Switch onion.c to use TRUNNEL_OPAQUE

[Tor Bug Tracker & Wiki]

#20918: Switch onion.c to use TRUNNEL_OPAQUE
------------------------------+--------------------------------
     Reporter:  nickm         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #15056
       Points:                |   Reviewer:
      Sponsor:                |
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 The TRUNNEL_OPAQUE macro stops trunnel from exposing object internals in
 its headers; we should use that in onion.c.  (And possibly elsewhere.)
 Noted by dgoulet during code review.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20918>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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