'zfs mount -a' from the main system - this is by design, as mountpoint
may be set to dangerous value. This all means, that such file system
has to be mounted from within a jail. To make it easier, reorganize
rc.d/zfs script so it can be used from within a jail.
NFS-share anything. This way we can safely start mountd with
/etc/zfs/exports and mountd won't complain.
Pointed out by: ceri
- Move 'zfs volinit' before 'zfs mount -a' and 'zfs volfini' after
'zfs unmount -a'.