All the configurations should now live in am-config.yaml
Instead of using /opt/am as the directory for the apps.db and app
installations /tmp/am should be used.

Using the same config now as neptune-ui.

Change-Id: Ic775ad9a64b613b5285ee5635357fd01135ca12e
Reviewed-by: Katja Marttila <katja.marttila@qt.io>
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>