[tor-bugs] #20218 [Core Tor/Tor]: Fix and refactor and redocument routerstatus_has_changed

[Tor Bug Tracker & Wiki]

#20218: Fix and refactor and redocument routerstatus_has_changed
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     Reporter:  nickm         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  029-proposed controller
Actual Points:                |  Parent ID:
       Points:  .1            |   Reviewer:
      Sponsor:                |
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 The routerstatus_has_changed() function is used by controllers to to tell
 which rs entries are new.  But it only looks at a fraction of the fields
 which might change in a routerstatus.  Also, it only checks for semantic
 changes that tor cares about (though this is not documented).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20218>
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