Bug 211004 Failed to remove temp db directory after running multiple reports
Description: I use Report Engine API to do runAndrender, run and dataextract tasks on multiple reports. Before the Platform started, I change the temp folder(System.setProperty( "java.io.tmpdir", TEMP_HOME )). Each task is closed after it finished and I shutdown the Platform after all the tasks finished. In log I found "Fail to remove one or more file in temp db directory,but it will be removed when the VM exits: D:\BIRT_NG\temp/BIRTSampleDB_1196129572031_10a6ae2". In temp folder the BIRTSampleDB_XXX is still here but not removed. I think it is the issue when remove the Temp sampleDB. Build number: 2.3.0.v20071127-0630
data/org.eclipse.birt.report.data.oda.jdbc/src/org/eclipse/birt/report/data/oda/jdbc/JDBCDriverManager.java
* Look for the Driver from drivers directory if it not in plugin class path
	 * 
	 * @param className
	 * @return Driver instance
	 * @throws OdaException 
	 */
	private Driver findDriver( String className, String driverClassPath ) throws OdaException
	{
		Class driverClass = null;
		try
		{
			driverClass = Class.forName( className );
			
			logger.info( "Loaded JDBC driver class in class path: " + className );
		}
		catch ( ClassNotFoundException e )
		{
				if ( logger.isLoggable( Level.FINE ) )
				{
					logger.info( "Driver class not in class path: "
							+ className
							+ ". Trying to locate driver in drivers directory" );
				}
				
				driverClass = loadExtraDriver( className, true, driverClassPath );
				
				if ( driverClass == null )
				{
					logger.warning( "Failed to load JDBC driver class: "
							+ className );