changes in notification parameters

[kdiogenes]

Hi,

In GNOME 3, critical messages doesn't expire, so I suggest to change their priority to 1 or less. They also stay in the systray after timeout, so I also suggest to add --hint=int:transient:1 to the notify-send call.

I think that these changes make sense, since tests will be executed pretty often with autotest, so it doesn't make sense to have these messages go away only after a mouse click in it.

Best regards!