[tor-bugs] #32563 [Core Tor/Tor]: Merge HSv3 spec fixes we found during onionbalance creation

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#32563: Merge HSv3 spec fixes we found during onionbalance creation
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:  asn
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs, scaling, onionbalance,       |  Actual Points:
  network-team-roadmap-september, tor-spec,      |
  network-team-roadmap-2020Q1                    |
Parent ID:  #26768                               |         Points:  0.2
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor27-must
-------------------------------------------------+-------------------------

Comment (by asn):

 Disaster SRV computation is:
 `H("shared-random-disaster" | INT_8(period_length) | INT_8(period_num))`
 and not the other way around.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32563#comment:4>
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