Import patches-unapplied version 2.316 to ubuntu/wily-proposed

Imported using git-ubuntu import.

Changelog parent: 426cc7e1e5

New changelog entries:
  * live-build/ubuntu-desktop-next/hooks/20-extra-files.chroot:
    - create /writable otherwise the mounts job fail and block the boot

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.316) wily; urgency=medium
+
+  * live-build/ubuntu-desktop-next/hooks/20-extra-files.chroot:
+    - create /writable otherwise the mounts job fail and block the boot
+
+ -- Sebastien Bacher <seb128@ubuntu.com>  Wed, 17 Jun 2015 17:10:18 +0200
+
 livecd-rootfs (2.315) wily; urgency=medium
 
   * live-build/ubuntu-core/hooks/500-move-kernel-to-device-tar.binary,

live-build/ubuntu-desktop-next/hooks/20-extra-files.chroot

@@ -0,0 +1,6 @@
+#! /bin/sh
+
+set -e
+
+echo "writable mounts directory" >&2
+mkdir -p /writable