Bug 212712 run --config "logdir=xxx" in genReport can not create folder auto[00]
Descriiption: run --config "logdir=xxx" in genReport can not create folder auto[00] Run the genReport, and add the variable of --config "logdir=xxx". If xxx is not exist, it will pop up the error. Expected: It can create the folder auto.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineLogger.java
if ( fileLogger != null )
		{
			closeFileLogger( fileLogger );
			fileLogger = null;
		}
		userLogger = null;
	}
	/**
	 * Change the log level to the newLevel
	 * 
	 * @param newLevel -
	 *            new log level
	 */
	public static void changeLogLevel( Level newLevel )
	{
		if ( newLevel != null )
		{
			if ( userLogger != null )
			{
				if ( newLevel != Level.OFF && fileLogger == null
						&& dirName != null )
				{
					fileLogger = createFileLogger( dirName );
					if ( fileLogger != null )
					{
						sharedHandler.setSharedLogger( fileLogger );
					}
				}
			}
			Logger rootLogger = Logger.getLogger( BIRT_NAME_SPACE );