first, mount root and run the various disk providers. Add swap and check the remaining file systems after that. This breaks the dependency cycle for lvm, which needs writeable /dev. Depend on rndctl in cgd.
for a speedup by doing: $_rc_subr_loaded . /etc/rc.subr
This allows us or a user to change the configuration file method in one place - rc.subr - without having to edit all of the rc.d/* files.