[tor-bugs] #31576 [Core Tor/Tor]: Fix shellcheck errors in contrib/dist/rc.subr, and add to test-shellcheck

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#31576: Fix shellcheck errors in contrib/dist/rc.subr, and add to test-shellcheck
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 Reporter:  teor          |          Owner:  (none)
     Type:  defect        |         Status:  new
 Priority:  Low           |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor  |        Version:
 Severity:  Minor         |     Resolution:
 Keywords:  shellcheck    |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Comment (by teor):

 Ok, I'll ask about both unmaintained service files:

 * contrib/dist
   * rc.subr - script
   * tor.service.in - systemd service ini file

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31576#comment:6>
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