MXS-2432 Add test that reveals issue

RESET is neither parsed not tokenized, so RESET statements ends
up being sent to the master. That is fine for all but RESET QUERY
CACHE that should be sent to all servers.

query_classifier/test/maxscale.test

@@ -129,3 +129,8 @@ XA PREPARE 'xid';
 XA COMMIT 'xid';
 XA ROLLBACK 'xid'
 XA RECOVER 'xid';
+
+# MXS-2432
+RESET QUERY CACHE;
+RESET MASTER;
+RESET SLAVE;