[InterNetNews/inn] 30454f: Exit with status 0 when printing usage message

[Julien ÉLIE]

  Branch: refs/heads/2.7
  Home:   https://github.com/InterNetNews/inn
  Commit: 30454f8ac1d860528c4df460488f49327c2845c5
      https://github.com/InterNetNews/inn/commit/30454f8ac1d860528c4df460488f49327c2845c5
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-01-26 (Thu, 26 Jan 2023)

  Changed paths:
    M backends/sendinpaths.in
    M contrib/backlogstat.in
    M contrib/thdexpire.in
    M control/controlchan.in
    M frontends/mailpost.in
    M frontends/pullnews.in
    M frontends/scanspool.in
    M innfeed/procbatch.in
    M innfeed/testListener.pl
    M scripts/innmail.in

  Log Message:
  -----------
  Exit with status 0 when printing usage message

Homogenize the exit status of INN programs when explicitly run with
a flag asking for printing their usage messages.  Status 0 should be
returned instead of 1.

Also, homogenize the format of the usage message.

This patch updates all Perl scripts using Getopt::Std.