Switching to select 1. Minimalize amount of data transferred.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/branches@10190 b35dd754-fafc-0310-a699-88a17e54d16e

openfire_3_5_1/src/java/org/jivesoftware/database/DbConnectionManager.java

@@ -818,7 +818,7 @@ public class DbConnectionManager {
 
     public static String getTestSQL(String driver) {
         if (driver.contains("db2")) {
-            return "select current_timestamp from sysibm.sysdummy1";
+            return "select 1 from sysibm.sysdummy1";
         }
         else if (driver.contains("oracle")) {
             return "select 1 from dual";