Added function to keep local/original config during update

config/Ubuntu_50unattended-upgrades

@@ -16,6 +16,11 @@ Unattended-Upgrade::Allowed-Origins {
 //	"${distro_id}:${distro_codename}-backports";
 };
 
+Dpkg::Options {
+   "--force-confdef";
+   "--force-confold";
+};
+
 // List of packages to not update (regexp are supported)
 Unattended-Upgrade::Package-Blacklist {
 	"vim";