[Merge] ~cpete/ubuntu-seeds/+git/ubuntu:kdump-tools-installed-by-default into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:oracular

[Steve Langasek]

(maybe the changes to disable it by default should instead be added to the package itself rather than livecd-rootfs, so they apply equally to release upgrades, but don't affect users who already have the package installed?)
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https://code.launchpad.net/~cpete/ubuntu-seeds/+git/ubuntu/+merge/473312
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