[tor-bugs] #28142 [Core Tor/Tor]: Merge original WTF-PAD branch

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#28142: Merge original WTF-PAD branch
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:
                                                 |  mikeperry
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.0.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  wtf-pad, tor-relay, tor-cell,        |  Actual Points:
  padding                                        |
Parent ID:  #28631                               |         Points:
 Reviewer:  asn                                  |        Sponsor:
                                                 |  Sponsor2
-------------------------------------------------+-------------------------

Comment (by asn):

 Hey Mike, I saw your comment on the meeting pad yesterday. I see you have
 one or two fixups remaining. So let's do the following: Finish with your
 fixups, push your branch, (update the PR if needed), and we can switch: I
 will take your branch and start doing fixups based on `PR#461`, and you
 can start writing unittests and increasing coverage. Let me know when we
 can do the switch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28142#comment:19>
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