Imported using git-ubuntu import.
Changelog parent: eb5162d504114dc3d5b0461bada2f3d9d580b997
New changelog entries:
* -touch/-core create /etc/mtab link, /lib/modules dir and the respective
writable mountpoints (/userdata for touch, /writable for core) so we do
not need to re-pack the rootfs on the system-image server to add them.