[Merge] ~paelzer/ubuntu-seeds/+git/platform:usrmerge-add-usr-is-merged into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:mantic

[Steve Langasek]

Review: Disapprove

I don't think we want either of these packages in main.  They are transitional packages; while the transition is still ongoing in Debian, in Ubuntu the transition completed two LTS cycles ago.

We should just patch init-system-helpers in Ubuntu to drop the dependency which is no longer needed.
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https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/platform/+merge/446838
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