adding archives automatically to updates.xml

Task-number: QTIFW-210
Task-number: QTIFW-248

Change-Id: I6deeade922dfe796df4223dae9e4a4744b7d6724
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>