[Bug 244640] [Patch][Lua loader] Implement missing "read-conf" 4th command

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244640

            Bug ID: 244640
           Summary: [Patch][Lua loader] Implement missing "read-conf" 4th
                    command
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: loader, patch-ready
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: olivier.freebsd at free.fr
             Flags: mfc-stable12?

Created attachment 212202
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=212202&action=edit
Patch adding "read-conf"

Please find attached a patch implementing "read-conf" in the Lua loader, as
defined in loader.4th(8). Is currently in use with `head` and `stable/12`
machines without problems.

For the record:

1. As this command is not built-in, it would normally have to obey Lua syntax,
which forbids calling functions having a `-` in their name with the common
function call syntax. However, .

2. As a workaround, one could type those two lines:
`config=require("config")`
`config.processFile "<conf_file_name>"`
but this is annoying and not officially documented (most probably on purpose).

Thank you.

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