get model from hw-release

Change-Id: I0d1bc0e943295cbaa43c2e5470acb24ed92fa63f
Reviewed-by: Jakub Adam <jakub.adam@ktknet.cz>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
try harder for unique ID, use wlan mac addy

Change-Id: Iac5112c6a781620f71de33e0dbc07041e91c0312
Reviewed-by: Jakub Adam <jakub.adam@ktknet.cz>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
prefer os-release for operating system name

Change-Id: I5b945948a17dbb830cdd451758c584d69eed7d24
Reviewed-by: Jakub Adam <jakub.adam@ktknet.cz>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>