[Merge] ~utkarsh/livecd-rootfs/+git/livecd-rootfs:add-buildinfo-file into livecd-rootfs:ubuntu/master

[Philip Roche]

Review: Needs Information

I still have one outstanding question about the removal of the existing build.info

@cris are you aware of anything that consumes this currently?

If you do then I think we will need to include this in the release notes

@utkarsh can you address the removal of this in your commit and the reasoning for removing it.
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https://code.launchpad.net/~utkarsh/livecd-rootfs/+git/livecd-rootfs/+merge/461713
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