Debian DLA-1032-1 : unattended-upgrades regression update

Since the release of the last Debian stable release 'stretch', Debian LTS 'wheezy' has been renamed 'oldoldstable', which broke the unattended-upgrades package as described in bug 867169. Updates would simply not be performed anymore. For Debian 7 'Wheezy', these problems have been fixed in versi...