[Merge] ~gjolly/livecd-rootfs:ubuntu-cpc/boot_partition into livecd-rootfs:ubuntu/master

[Thomas Bechtold]

> Minor point, but I don't think you should regress the comprehensibility of the
> code around setting image size limits

@Steve, Gauthier is currently out but CPC would like to get this in for mantic asap. I created https://code.launchpad.net/~toabctl/livecd-rootfs/+git/livecd-rootfs-1/+merge/451330 which hopefully addresses your comment. Could you have a look please?
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https://code.launchpad.net/~gjolly/livecd-rootfs/+git/livecd-rootfs/+merge/448592
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