Import patches-unapplied version 2.443 to ubuntu/artful-proposed

Imported using git-ubuntu import.

Changelog parent: de6bd722ae1c82766d1b037be8814b55f3249a73

New changelog entries:
  * Mark autopkgtests isolation-machine since debootstrap won't work in a
    container.
  * Use xz to compress ubuntu-image .img files before transfer, so that we
    have smaller downloads and retain file sparseness everywhere.

debian/changelog

@@ -1,3 +1,12 @@
+livecd-rootfs (2.443) artful; urgency=medium
+
+  * Mark autopkgtests isolation-machine since debootstrap won't work in a
+    container.
+  * Use xz to compress ubuntu-image .img files before transfer, so that we
+    have smaller downloads and retain file sparseness everywhere.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Fri, 28 Apr 2017 17:50:07 -0700
+
 livecd-rootfs (2.442) artful; urgency=medium
 
   [ Robert Jennings ]

debian/tests/control

@@ -1,3 +1,3 @@
 Tests: default-bootstraps
 Depends: @, lsb-release
-Restrictions: needs-root
+Restrictions: needs-root isolation-machine

live-build/auto/build

@@ -17,7 +17,10 @@ fi
 
 if [ "${IMAGEFORMAT:-}" = "ubuntu-image" ]; then
 	# Use ubuntu-image instead of live-build
+	apt-get install -qqy pxz
+
 	env SNAPPY_STORE_NO_CDN=1 ubuntu-image -o livecd."$PROJECT".img livecd."$PROJECT".model-assertion
+	pxz -T4 livecd."$PROJECT".img
 	exit 0
 fi