Support systemd socket activation support more comprensively #7892
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Motivation
We now support:
Multiple sockets, per the systemd socket activation spec
The sockets not having pid/uid/gid peer info because they might not be Unix domain sockets.
Context
The changes are by @edolstra, taken from #5265. This is just that PR without the TCP parts, which I gathered are the controversial parts. Hopefully this remainder is not so controversial.
Checklist for maintainers
Maintainers: tick if completed or explain if not relevant
tests/**.sh
src/*/tests
tests/nixos/*