[Merge] ~seb128/livecd-rootfs:rename_schemas_override into livecd-rootfs:ubuntu/master

[Sebastien Bacher]

an alternative solution would be to move the 22desktop_settings schemas override part to the new override in livecd-rootfs, I'm not sure though if any flavor rely on those keys (the casper override is for everyone where the new livecd-rootfs one isn't)
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https://code.launchpad.net/~seb128/livecd-rootfs/+git/livecd-rootfs/+merge/462938
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