merged filter-aaaa-on-v6 (ATT SoW)

3327.	[func]		Added 'filter-aaaa-on-v6' option; this is similar
			to 'filter-aaaa-on-v4' but applies to IPv6
			connections.  (Use "configure --enable-filter-aaaa"
			to enable this option.)  [RT #27308]

bin/tests/system/statistics/tests.sh

@@ -84,8 +84,7 @@ status=`expr $status + $ret`
 ret=0
 echo "I: verifying active sockets output"
 nsock1=`grep "UDP/IPv4 sockets active" ns3/named.stats | awk '{print $1}'`
-[ "$nsock0" -eq 2 ] || ret=1
-[ "$nsock1" -eq 3 ] || ret=1
+[ `expr $nsock1 - $nsock0` -eq 1 ] || ret=1
 if [ $ret != 0 ]; then echo "I: failed"; fi
 status=`expr $status + $ret`