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

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#28142: Merge original WTF-PAD branch
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 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
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Comment (by asn):

 Hey Mike,

 I reviewed your latest `adaptive_padding-20181218-rebased` and it looks
 great! On this note I took your branch and did the following changes:
 - Tested the unittests for memleaks with ASAN (all good).
 - Disabled the current machines
 and also rebased it to latest master (so that CI runs) and made a PR out
 of it: https://github.com/torproject/tor/pull/622

 Let me know what else there is to do. Otherwise, we should make a squashed
 version of this branch for the final review and merge by Nick. I can do
 the squash no problem.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28142#comment:26>
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