[Merge] ~alexghiti/livecd-rootfs:int/alex/fk_force into livecd-rootfs:ubuntu/master

[Thomas Bechtold]

Review: Needs Information

I don't understand why this is needed and what actually happens if we use FK_FORCE instead of FK_FORCE_CONTAINER. Who's using FK_FORCE and/or FK_FORCE_CONTAINER? Can you be a bit more verbose please?
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https://code.launchpad.net/~alexghiti/livecd-rootfs/+git/livecd-rootfs/+merge/429646
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