[Merge] ~utkarsh/livecd-rootfs/+git/livecd-rootfs:use-packaged-unminimize into livecd-rootfs:ubuntu/master

[Utkarsh Gupta]

This needs to wait for the seed changes to land which are here: 
https://code.launchpad.net/~utkarsh/ubuntu-seeds/+git/ubuntu/+merge/464394
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https://code.launchpad.net/~utkarsh/livecd-rootfs/+git/livecd-rootfs/+merge/465177
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