Fix zconfig.sh test 9

Commit ba6a240 adjusted the behavior of 'zfs create -V'.  The
caller is no longer guaranteed that udev will have finished
creating the /dev/ entries by the time to command exits.  It
is therefore required that we explicitly block waiting for
udev to settle for this test to run reliably.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

scripts/zconfig.sh

@@ -554,6 +554,7 @@ test_9() {
 	${ZFS_SH} zfs="spa_config_path=${TMP_CACHE}" || fail 1
 	${ZPOOL_CREATE_SH} -p ${POOL_NAME} -c lo-raidz2 || fail 2
 	${ZFS} create -V 300M ${FULL_NAME} || fail 3
+	udev_trigger
 
 	# Dump the events, there should be at least 5 lines.
 	${ZPOOL} events >${TMP_EVENTS} || fail 4