Update-notifier should be aware of suspend/hibernate

[hackel]

Binary package hint: update-notifier

Whenever resume my computer from hibernating (over night or more) I get the "The update information is outdated" warning. Yes, of course it is outdated--the computer was off. If I update manually, it goes away, even if there were no new updates to install. Update-notifier needs to be aware of this common scenario and not present a warning, because this is normal behaviour. Instead, it should trigger an automatic update once it regains a network connection. Basically, update-manager should treat suspend/hibernate identically to the computer being off. This may be related to bug #392603.

<https://wiki.ubuntu.com/SoftwareUpdates#check-automatic>: "Once it is due to check for updates, [Ubuntu] should try to check one minute after the first time any administrator connects to the Internet."