[tor-bugs] #21978 [Core Tor/Tor]: hs: Decouple adding and validating a service

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#21978: hs: Decouple adding and validating a service
-------------------------------+--------------------------------
     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:  #21888
       Points:  0.2            |   Reviewer:
      Sponsor:  SponsorR-must  |
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 One commit that splits the `rend_add_service()` function into two
 functions. One actually adding the service to the global list and the
 second one to validate the service thus adding a new function:
 `rend_validate_service()`

 We need this for prop224 code that will in two steps validate and then add
 the service when loading a service from configuration.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21978>
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