[Merge] ~rbalint/ubuntu/+source/systemd:tests-in-lxd into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-groovy

[Balint Reczey]

There is one more unittest failing, i need to patch that, too, before this can be merged.
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https://code.launchpad.net/~rbalint/ubuntu/+source/systemd/+git/systemd/+merge/383501
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