[tor-bugs] #30901 [Core Tor/Tor]: Add control port trace logging to tor

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#30901: Add control port trace logging to tor
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  enhancement                          |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.2.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-ci-fail-sometimes network-team-  |  Actual Points:  1.8
  roadmap-august                                 |
Parent ID:  #29437                               |         Points:  1
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor31-can
-------------------------------------------------+-------------------------
Changes (by teor):

 * keywords:
     tor-ci-fail-sometimes, network-team-roadmap-august,
     042-deferred-20190918
     => tor-ci-fail-sometimes network-team-roadmap-august
 * milestone:  Tor: 0.4.3.x-final => Tor: 0.4.2.x-final


Comment:

 I've split some unrelated code out of this branch. Now I can use some of
 the previous code to implement a cleaner solution.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30901#comment:19>
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