[tor-bugs] #20526 [Core Tor/Tor]: Implement `rend_service_is_ephemeral()`

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#20526: Implement `rend_service_is_ephemeral()`
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 Reporter:  twim          |          Owner:
     Type:  enhancement   |         Status:  merge_ready
 Priority:  Low           |      Milestone:  Tor: 0.3.0.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tor-hs        |  Actual Points:
Parent ID:                |         Points:  0.1
 Reviewer:  dgoulet       |        Sponsor:
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Comment (by twim):

 {{{
   o Refactoring (onion services):
     - Introduce rend_service_is_ephemeral() that tells if given onion
       service is ephemeral. Replace unclear NULL-checkings for service
       directory with this function.
       Closes ticket 20526.
 }}}
 Does this look plausible?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20526#comment:6>
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