to issue sub-commands, e.g., restart = stop + start.
By calling run_rc_command instead, we provide rc.d
scripts with full control over their configuration
variables.
For an example problem the former approach caused, see
http://lists.freebsd.org/pipermail/freebsd-rc/2005-October/000311.html
Reviewed by: freebsd-rc
Tested by: Dirk Engling erdgeist <at> erdgeist.org
MFC after: 2 weeks