unattended upgrades: LXD, Docker

ubuntu_server/templates/etc/apt/apt.conf.d/Ubuntu_50unattended-upgrades.erb

@@ -4,6 +4,8 @@ Unattended-Upgrade::Allowed-Origins {
 	"${distro_id}:${distro_codename}-updates";
 //	"${distro_id}:${distro_codename}-proposed";
 //	"${distro_id}:${distro_codename}-backports";
+    "LP-PPA-ubuntu-lxc-lxd-stable:${distro_codename}";
+    "Docker:ubuntu-${distro_codename}";
     "Puppetlabs:${distro_codename}";
 
 };