[tor-bugs] #19883 [Core Tor/Tor]: Maintain CONFIRMED_GUARDS per new guard plan

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#19883: Maintain CONFIRMED_GUARDS per new guard plan
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     Reporter:  andrea        |      Owner:
         Type:  task          |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: unspecified
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #19877
       Points:  3             |   Reviewer:
      Sponsor:  SponsorU      |
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 New guard plan summarized at https://lists.torproject.org/pipermail/tor-
 dev/2016-July/011234.html

 7) Maintain CONFIRMED_GUARDS
  - Add guard to CONFIRMED_GUARDS when circuit succeeds
  - Fill in state info for each confirmed guard (confirmed_on_date, etc.)
  - Migration from old state format to new
  - Thoughtworks unittest: test_used_guards_parse_state()

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19883>
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