[v9_10] Do not NOTIFY back the master view from slave views in notify system test

This prevents a Linux kernel bug discussed in RT #32355 from being
triggered and thus makes "checking notify to multiple views using tsig"
stable.

(cherry picked from commit 27bf48327c)

bin/tests/system/notify/ns5/named.conf

@@ -62,6 +62,7 @@ view "b" {
 		type slave;
 		masters { 10.53.0.5 key "a"; };
 		file "x21.bk-b";
+		notify no;
 	};
 };
 
@@ -71,5 +72,6 @@ view "c" {
 		type slave;
 		masters { 10.53.0.5 key "a"; };
 		file "x21.bk-c";
+		notify no;
 	};
 };