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

[Steve Langasek]

Review: Approve

Looks good. 

Is there anything we need to do on upgrades of existing systems? Since adding it to the seed does been it will also be pulled in by default on upgrade.
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https://code.launchpad.net/~cpete/ubuntu-seeds/+git/ubuntu/+merge/473312
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