[tor-bugs] #19880 [Core Tor/Tor]: Maintain set of PRIMARY_GUARDS per new guard plan

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#19880: Maintain set of PRIMARY_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:                |   Reviewer:
      Sponsor:  SponsorU      |
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 New guard plan summarized at https://lists.torproject.org/pipermail/tor-
 dev/2016-July/011234.html

 4) Maintain set of PRIMARY_GUARDS
  - Functions to extract set of (live) primary guards out of
 FILTERED_GUARDS
  - Unittest
  - Thoughtworks function: retry_primary_guards() / next_primary_guard()
  - Thoughtworks unittests: test_next_primary_guard()

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19880>
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