Fix lingering reference to livecd-rootfs.ubuntu-core.model-assertion

that breaks the ubuntu-core image build.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.483) UNRELEASED; urgency=medium
+
+  * Fix lingering reference to livecd-rootfs.ubuntu-core.model-assertion
+    that breaks the ubuntu-core image build.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Mon, 13 Nov 2017 09:14:44 -0800
+
 livecd-rootfs (2.482) bionic; urgency=medium
 
   * Remove boot/grub leftovers from our root squashfs, left behind after

live-build/auto/config

@@ -184,7 +184,7 @@ case $IMAGEFORMAT in
 		# Store model assertion in top dir to get it picked up later as a build artifact
 		env SNAPPY_STORE_NO_CDN=1 snap known --remote model series=16 model="$MODEL" brand-id=canonical > "$PREFIX".model-assertion
 		echo "Configured ubuntu-image for the following model assertion:"
-		cat livecd."$PROJECT".model-assertion
+		cat "$PREFIX".model-assertion
 		echo "----------------------------------------------------------"
 		# Fake finished configuration for lb build
 		mkdir -p .build