Revert "os/user: lookup Linux users and groups via systemd userdb"
This reverts CL 459455.
Reason for revert: breaks tests on various platforms, see https://go-review.googlesource.com/c/go/+/459455/74#message-
3d9462b24872f6e0b12b4abf5ea3983e1588f91a
Change-Id: I4c79b28f750c2369909688f86616d76d7eaf0ab4
Reviewed-on: https://go-review.googlesource.com/c/go/+/479135
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