modify bench

odbctest/mql/bench/event/99clear.mql

@@ -1,3 +1,6 @@
-delete from /bench/event/alerts_status1 with version ;
-drop class /bench/event/alerts_status1;
-drop class /bench/event;
+
+--drop class /bench/event/alerts_status1;
+--drop class /bench/event/alerts_status2;
+--drop class /bench/event/alerts_status3;
+--drop class /bench/event/alerts_status4;
+--drop class /bench/event;