[tor-bugs] #28847 [Core Tor/Tor]: Use new subsystems API for initializing the process subsystem

[Tor Bug Tracker & Wiki]

#28847: Use new subsystems API for initializing the process subsystem
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     Reporter:  ahf           |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.4.0.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: unspecified
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #28179
       Points:                |   Reviewer:
      Sponsor:  Sponsor8      |
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 Right now we call `process_init()` in `tor_init()` for the process
 subsystem. We should refactor this to make use of the new subsystem API.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28847>
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