[tor-bugs] #30866 [Core Tor/Tor]: Teach config.c to work with options configured in other modules

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#30866: Teach config.c to work with options configured in other modules
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 Reporter:  nickm         |          Owner:  nickm
     Type:  enhancement   |         Status:  needs_revision
 Priority:  Medium        |      Milestone:  Tor: 0.4.3.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:  #29211        |         Points:  2
 Reviewer:  teor          |        Sponsor:  Sponsor31-can
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Comment (by nickm):

 I've rebased as `config_subsys_2` and started making the requested
 changes.  There's a PR at https://github.com/torproject/tor/pull/1501 so I
 can keep an eye on coverage and CI.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30866#comment:7>
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