- Create an empty /etc/zfs/exports file when zfs_enable="YES" and we don't 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'.