Imported using git-ubuntu import.
Changelog parent: 1db37274ff3418f274464e542c7662fba2d6242a
New changelog entries:
[ Michael Hudson-Doyle ]
* Automount a partition of fixed UUID for giving subiquity canned answers.
[ Balint Reczey ]
* Use default xz compression (-6) for raspi2 image.
Xz with -0 generated ~35% bigger compressed image. (LP: #1732681)
* Zero fill space in UEFI partitions, too
* Set LB_ISO_PREPARER to livecd-rootfs to avoid unbound variable in
default string
* Build minimized images in a 1GiB image
