add schema error reporting of unexpected data type

UNEXPECTED_TYPE is added to ErrorType in schema, so it can be exported
out as sax errorstate

[GF-3835] sam needs more robust error reporting for app parsing errors

Open-webOS-DCO-1.0-Signed-off-by: DongHeon Jang <dongheon.jang@lge.com>

Change-Id: If40dfc06da7c28777687203294c3127039a7cf78