set a query source so that notify packets get sent with

the correct source address and are accepted by the slave as coming
from a master

bin/tests/system/xfer/ns2/named.conf

@@ -1,6 +1,7 @@
 options {
 	pid-file "named.pid";
 	listen-on { 10.53.0.2; };
+	query-source address 10.53.0.2 port 1995;
 	recursion no;
 	notify yes;
 };