This script parses output of userland tools. In the case of a faulted

zpool the output causes the script to bail out with syntax errors.
Since a scrub of a faulted zpool is pointless, just skip over any pools
marked as such.

PR:	conf/150228
Submitted by:	jpaetzel
Approved by:	kib (mentor)
MFC after:	3 days
MFC note:	only for RELENG_8

etc/periodic/daily/800.scrub-zfs

@@ -24,13 +24,17 @@ case "$daily_scrub_zfs_enable" in
 
 	for pool in ${daily_scrub_zfs_pools}; do
 		# sanity check
-		zpool list ${pool} >/dev/null 2>&1
+		_status=$(zpool list ${pool} | sed -n -e '$p')
 		if [ $? -ne 0 ]; then
 			echo "   WARNING: pool '${pool}' specified in"
 			echo "            '/etc/periodic.conf:daily_scrub_zfs_pools'"
 			echo "            does not exist"
 			continue
 		fi
+		if echo ${_status} | grep -q FAULTED; then
+			echo "Skipping faulted pool: ${pool}"
+			continue
+		fi
 
 		# successful only if there is at least one pool to scrub
 		rc=0