Comment 19 for bug 22460

@Jim
It seems also at first thought better from my usage point of view to have the scan at shutdown. Because, I usually shut down my computer and go doing other things without looking at it.
However, the "shutdown" phase is also used upon reboot (at least, I do not know if the scripts executed upon shutdown can guess if it is a reboot or shutdown...) And I am not sure then if I prefer to have the scan on shutdown/reboot...
But anyway, that's an idea :-)