Import patches-unapplied version 2.503 to ubuntu/bionic-proposed

Imported using git-ubuntu import.

Changelog parent: cfcac92328

New changelog entries:
  * Install linux-signed-generic in the live-server image. (LP: #1749065)

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (2.503) bionic; urgency=medium
+
+  * Install linux-signed-generic in the live-server image. (LP: #1749065)
+
+ -- Michael Hudson-Doyle <michael.hudson@ubuntu.com>  Thu, 15 Feb 2018 09:54:14 +1300
+
 livecd-rootfs (2.502) bionic; urgency=medium
 
   * Shuffle subiquity service definition to a mix of a snapd-generated service

live-build/auto/config

@@ -496,6 +496,9 @@ case $PROJECT in
 				add_task install standard
 				add_task install server
 				LIVE_TASK='cloud-image'
+				case $ARCH in
+					amd64)	add_package live linux-signed-generic ;;
+				esac
 				;;
 		esac
 		COMPONENTS='main'