Import patches-unapplied version 2.280 to ubuntu/vivid-proposed

Imported using git-ubuntu import.

Changelog parent: 552fc27ec0

New changelog entries:
  * live-build/ubuntu-core/hooks/02-add_user_to_groups.chroot: use commas
    instead of spaces.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.280) vivid; urgency=medium
+
+  * live-build/ubuntu-core/hooks/02-add_user_to_groups.chroot: use commas
+    instead of spaces.
+
+ -- Loïc Minier <loic.minier@ubuntu.com>  Wed, 04 Feb 2015 18:03:08 +0100
+
 livecd-rootfs (2.279) vivid; urgency=medium
 
   * Revert changes to post-debootstrap hashes for core.

live-build/ubuntu-core/hooks/02-add_user_to_groups.chroot

@@ -2,7 +2,7 @@
 
 USER=ubuntu
 
-DEFGROUPS="docker sudo"
+DEFGROUPS="docker,sudo"
 
 echo "I: add $USER to ($DEFGROUPS) group(s)"
 usermod -a -G ${DEFGROUPS} ${USER}