[tor-bugs] #17238 [Core Tor/Tor]: prop224: Implement HSDir support

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#17238: prop224: Implement HSDir support
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 Reporter:  dgoulet                              |          Owner:  dgoulet
     Type:  enhancement                          |         Status:
                                                 |  needs_revision
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.2.9.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs, prop224, TorCoreTeam201608,  |  Actual Points:
  review-group-7, actualreviewpoints=2           |
Parent ID:  #12424                               |         Points:  parent
 Reviewer:  asn                                  |        Sponsor:
                                                 |  SponsorR-must
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Comment (by asn):

 Please see brach `ticket17238_029_11` in my repo.

 It features:
 - It adds support for fetching descs from HSDirs (using "/tor/hs/3/<id>"
 path)
 - It adds high-level unittests for pushing/fetching descs from HSDirs.
 - It introduces a prefix for desc signatures.
 - It's rebased on latest git master.
 - It fixes a few bugs and improves some code.
 - Addresses check-spaces (although in its own commit).

 David another thing we should discuss is whether we should guard all this
 HSDir cache code with a consensus parameter, or we should just leave it
 there active but unused till we deploy the rest of the prop224 parts.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17238#comment:16>
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