[Merge] ~medicalwei/livecd-rootfs:ubuntu-oem-reorg into livecd-rootfs:ubuntu/master

[Yao Wei]

Also I found a funny inconsistency for the image name: MINIMAL_PREFIX="minimal." (contains minimal) and LIVE_PREFIX="minimal.standard." (doesn't contain live)

That's out of the scope of this changeset, though.
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https://code.launchpad.net/~medicalwei/livecd-rootfs/+git/livecd-rootfs/+merge/460822
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