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

[Tor Bug Tracker & Wiki]

#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         |   Keywords:  shellcheck
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 This would be nice to have, but it's not urgent at all.

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