[Rpm-maint] [rpm-software-management/rpm] Add a man page for rpm sysusers integration (PR #4126)

[Michal Domonkos]

@dmnks commented on this pull request.



> +# DESCRIPTION
+
+RPM has native support for the *sysusers.d*(5) format (introduced by systemd)
+that enables packages to declare users and/or groups to be automatically created
+at installation time. This eliminates the need for the manual creation of such
+accounts in transaction scriptlets.
+
+This works implicitly if a package ships one or more files in this format under
+*%\_sysusersdir* (typically _/usr/lib/sysusers.d/_). RPM will then automatically
+invoke the *%\_\_systemd_sysusers* binary (typically *systemd-sysusers*(8)) with
+the correct arguments in order to create the user and/or group accounts when the
+package is installed. This is the recommended method on systemd native platforms
+and requires no intervention from the package beyond shipping those files.
+
+RPM also allows for declaring sysusers.d entries explicitly in the spec file
+with the *%add_sysuser* macro. This macro takes a sysusers.d line with its

I ended up using the man page reference format in most places (that talk about the file itself), but kept the "sysusers.d lines" without the ref. Not that the latter would be wrong with the ref, but this reduces the overall noise a bit :smile: 

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