[Merge] lp:~tobijk/livecd-rootfs/image-set-support into lp:livecd-rootfs

[Balint Reczey]

The target Bazaar branch is not active anymore.
Please resubmit the merge proposal against https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+ref/ubuntu/master .
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https://code.launchpad.net/~tobijk/livecd-rootfs/image-set-support/+merge/360333
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~tobijk/livecd-rootfs/image-set-support into lp:livecd-rootfs.