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
* 
	 * @param String className
	 */
	public void updateStatus( String className )
	{
		if ( isDeregistered( className ) )
		{
			registeredDrivers.remove( className );
		}
	}
	
	/**
	 * Check whether the driver class name is deregistered
	 * 
	 * @param String className
	 * @return true if the driver class name is deregistered
	 */
	private boolean isDeregistered( String className )
	{
		return this.registeredDrivers.containsKey( className )
				&& registeredDrivers.get( className ).equals( DRIVER_DEREGISTERED );
	}
	
	private void loadAndRegisterDriver( String className, String driverClassPath ) 
		throws OdaException
	{
		if ( className == null || className.length() == 0)
			
			return;
		if ( isDeregistered( className ) )