apt::reboot_required_notify: take into account the random sleep time.

manifests/reboot_required_notify.pp

@@ -8,11 +8,12 @@ class apt::reboot_required_notify {
   }
 
   # cron-apt defaults to run every night at 4 o'clock
+  # plus some random time <1h.
   # so we check if a reboot is required a bit later.
   cron { 'apt_reboot_required_notify':
     command => 'if [ -f /var/run/reboot-required ]; then echo "Reboot required\n" ; cat /var/run/reboot-required.pkgs ; fi',
     user    => root,
-    hour    => 4,
+    hour    => 5,
     minute  => 20,
     require => Package['update-notifier-common'],
   }