This adds a test for fingerprint-based login, as requested by
@benzea in #223. We use the fprintd dummy device to let us
simulate scanning a fingerprint, and check various scenarios
recommended by @benzea.
Signed-off-by: Adam Williamson <awilliam@redhat.com>
This is doing slightly less to exercise the launcher menus and see
whether icons appear or disappear, but it's much faster and more
reliable. We do still use menu launch for one app, just to check
the mechanism works in general.