Use the pidfile support added to ggated(8) in r294973 to ensure that the

ggated(8) daemon used by the tests is the instance specifically invoked by
the tests instead of one or more daemon instances running on the system

MFC after: 1 month
Sponsored by: EMC / Isilon Storage Division

tests/sys/geom/class/gate/1_test.sh

@@ -10,6 +10,7 @@ us=0
 while [ -c /dev/ggate${us} ]; do
 	: $(( us += 1 ))
 done
+pidfile=ggated.$$.pid
 conf=`mktemp $base.XXXXXX` || exit 1
 port=33080
 
@@ -19,7 +20,7 @@ src=$(attach_md -t malloc -s 1M)
 test_cleanup()
 {
 	ggatec destroy -f -u $us
-	killall ggated
+	pkill -F $pidfile
 	geom_test_cleanup
 }
 trap test_cleanup ABRT EXIT INT TERM
@@ -30,7 +31,7 @@ src_checksum=$(md5 -q /dev/$src)
 
 echo "127.0.0.1 RW /dev/$work" > $conf
 
-if ! ggated -p $port $conf; then
+if ! ggated -p $port -F $pidfile $conf; then
 	echo 'ggated failed to start'
 	echo 'Bail out!'
 	exit 1