[tor-bugs] #21891 [Core Tor/Tor]: hs: Refactoring of some part of the legacy code for prop224 usage

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#21891: hs: Refactoring of some part of the legacy code for prop224 usage
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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:
       Points:  1              |   Reviewer:
      Sponsor:  SponsorR-must  |
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 This branch contains 4 commits that we need for prop224 service
 implementation work (#20657).

 First commit is a trivial refactor to make a function in rendservice.c
 public and broader to both HS subsystems (legacy and new).

 Second and third commit are code moving and minor cleanup.

 Fourth commit is a bit more involving that is making the pruning
 rendservice list public so the HS prop224 code can use it later on with
 #20657 work.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21891>
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