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.
If set to yes, block-type swap partitions will be deleted upon shutdown.
This can be useful if swapping onto a RAIDframe device, but may cause
unnecessary delays during shutdown for the general case, so it's
disabled by default.
Should resolve [bin/14433] and [kern/14769].
apb