[Merge] ~jibel/livecd-rootfs:ubuntu-wsl into livecd-rootfs:ubuntu/master

[Gauthier Jolly]

Review: Approve

> Note that the WSL images must be published to a separate directory ie. ubuntu-wsl/<release>

Yes, it will.
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https://code.launchpad.net/~jibel/livecd-rootfs/+git/livecd-rootfs/+merge/417021
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