rc.subr: Passing extra arguments to run_rc_command

[Julio Merino <jmmv84%gmail.com@localhost>]

Hello,

[ Please CC me any replies ]

The run_rc_command function from rc.subr(8) only allows giving it a
command name, and this command name cannot take any extra arguments.

While writing an rc.d script for monotone, which provides a few
non-standard commands, I felt the need to pass extra arguments to my
custom commands.  To do so, I had to mess around with the original
argv, which is obviously not a nice approach.

Therefore, I'd like to modify run_rc_command to take a set of optional
extra arguments that will later be fed to the _precmd, _cmd and
_postcmd functions.  See the attached patch.

Any objections or comments?

I'm now in the process of updating the manual page and writing tests
for the new feature.

Thanks!

-- 
Julio Merino

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