[Merge] livecd-rootfs:raspi-desktop-1 into livecd-rootfs:ubuntu/master

[Łukasz Zemczak]

Not a copy-paste error - our current raspi server images install the cloud-image task, so I didn't want to deviate from that. But since we checked that there doesn't seem to be anything needed, I dropped it.
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https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+merge/391679
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