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

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#20218: Fix and refactor and redocument routerstatus_has_changed
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 Reporter:  nickm                                |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ipv6, 029-proposed, tor-control,     |  Actual Points:  0.5
  easy, spec-conformance, review-group-31,       |
  034-triage-20180328, 034-removed-20180328      |
  043-can                                        |
Parent ID:                                       |         Points:  .1
 Reviewer:  teor                                 |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 Here's the PR merged into the current master, with conflicts resolved:
 * master: https://github.com/torproject/tor/pull/1673

 Waiting for CI to pass before merging.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20218#comment:52>
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