ApplicationLauncher: Also emit the exit status

And adjust the message in the appliation output to take the exit status
into account.

Change-Id: I1b7507fdc8ff6fa7ec3db48dba72ad723f124fc3
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Daniel Teske <daniel.teske@digia.com>