Bug#925473: consider opensysusers

[Thorsten Glaser]

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>Message-ID: <87k0unhopc.fsf at c6.deuxchevaux.org>

[…]

>If that's not possible, you probably need to add a dependency on
>"systemd | opensysusers" and check for "sysusers" or "opensysusers"
>instead of systemd-sysusers, too. opensysusers is an alternative
>implementation of systemd's sysusers that also works with other init
>systems or without init system at all.