[Merge] ~juliank/ubuntu/+source/systemd:lp1805183 into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-disco

[Julian Andres Klode]

The trick here with the md5sum and redirecting stderr to stdout means we easily handle newly created and absent files too, and don't have to worry about this, while keeping it short.
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https://code.launchpad.net/~juliank/ubuntu/+source/systemd/+git/systemd/+merge/360990
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