reboot_required_notify: add initial support for Jessie and newer.

Note that reboot-notifier is only in stretch/sid at the moment,
so to use this one needs to configure APT pinning themselves
to make this package installable.

manifests/reboot_required_notify.pp

@@ -1,5 +1,18 @@
 class apt::reboot_required_notify {
 
-  class { 'apt::reboot_required_notify::wheezy': }
+  $jessie_or_newer = $::operatingsystemmajrelease ? {
+    5       => false,
+    6       => false,
+    7       => false,
+    default => true,
+  }
+
+  if $jessie_or_newer {
+    class { 'apt::reboot_required_notify::jessie': }
+    # Clean up systems that were upgraded from Wheezy or earlier:
+    class { 'apt::reboot_required_notify::wheezy': ensure => absent }
+  } else {
+    class { 'apt::reboot_required_notify::wheezy': }
+  }
 
 }

manifests/reboot_required_notify/jessie.pp

@@ -0,0 +1,13 @@
+class apt::reboot_required_notify::jessie ($ensure = present) {
+
+  # On Jessie and newer, this package installs the script that created
+  # /var/run/reboot-required*.
+  # This script (/usr/share/update-notifier/notify-reboot-required) is
+  # triggered e.g. by kernel packages.
+  # This package also sends a daily email to the administrator when a system
+  # reboot is required, e.g. due to a kernel update.
+  package { 'reboot-notifier':
+    ensure => $ensure,
+  }
+  
+}