Get rid of static Atffiles and let bsd.test.mk generate them on the fly.

Add some basic tests for rc.d scripts to validate the execution of
subcommands and the optional argument passing to them from the command
line.

Triggered by the modification of the run_rc_command fu

Add some basic tests for rc.d scripts to validate the execution of
subcommands and the optional argument passing to them from the command
line.

Triggered by the modification of the run_rc_command function in rc.subr
to allow passing in extra parameters to the commands defined in rc.d
scripts.

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