```
rc.d/zfs: Add shutdown to KEYWORDS
The problem is that Without walling /etc/rc.d/zfs on shutdown, resources
associated with ZFS mounts are not freed and the jails will remain in dying
state. In addition, the dataset is now in a dangling state, as the jail it is
attached to is dying.
A known workaround for jails was to add the following lines to /etc/jail.conf,
to make sure theat "service zfs stop" is run when the jail is stopped:
exec.stop = "/bin/sh /etc/rc.shutdown";
exec.stop += "/usr/sbin/service zfs stop || /usr/bin/true";
While the workaround seems to be okay-ish for the jail situation, it is still
unclean. However, for physical hosts this may wreak havoc with the pool if
shared spares are used, as "zfs unshare" is never invoked on shutdown.
Reported by: Mykah <mburkhardt__exavault_com>
Submitted by: Markus Stoff <markus__stoffdv_at>
MFC: 1 week
```