[tor-bugs] #21979 [Core Tor/Tor]: prop224: Load and configure service

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#21979: prop224: Load and configure service
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     Reporter:  dgoulet        |      Owner:  dgoulet
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  tor-hs, prop224
Actual Points:                 |  Parent ID:  #20657
       Points:  6              |   Reviewer:
      Sponsor:  SponsorR-must  |
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 This is a much bigger patch implementing a key feature of hidden service.
 Loading and configuring a service from the torrc file.

 A new object is added which is `hs_service_t` representing a v3 service.
 The `hs_config.[ch]` files are introduced which loads the options and
 create an `hs_service_t` object out of it.

 Like the legacy code, it goes in two steps. First, load the options and
 validate. Then, load/generate the keys if not in validate mode.

 Some refactoring of the legacy code was needed in order to have a central
 entry point for the configuration of the HS options for both v2 and v3.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21979>
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