[tor-bugs] #28778 [Core Tor/Tor]: Rename some circuitpadding structs

[Tor Bug Tracker & Wiki]

#28778: Rename some circuitpadding structs
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     Reporter:  asn      |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  wtf-pad, tor-relay, tor-cell,
     Severity:  Normal   |  padding, refactor
Actual Points:           |  Parent ID:  #28637
       Points:           |   Reviewer:
      Sponsor:           |
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 See https://github.com/torproject/tor/pull/461#discussion_r231885343 and
 https://github.com/torproject/tor/pull/461#discussion_r232343640 for a
 discussion to rename some of the essential structs of circuitpadding to
 better reflect their semantics.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28778>
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