[Rpm-maint] [rpm-software-management/rpm] config file moving aid (#1296)

[Ludwig Nussel]

There are efforts to get rid of distro default config files in /etc in favor of built in defaults or files in eg /usr/etc. Means rpms no longer install stuff into /etc. The transition there however requires some handling of existing files in /etc. Unmodified ones should get removed while modified ones need to stay in place. Right now on openSUSE side we have an advice in the wiki to add [scriptlets](https://en.opensuse.org/openSUSE:Packaging_UsrEtc#Moving_of_configuration_files) in %pre and %posttrans. Not exactly convenient nor smart.

Also, that model assumes that such packages have no mention of the config files in /etc at all anymore. IMHO it would still be desirable own the ones in /etc though. So if one runs `rpm -qc vim` one would see `/etc/vimrc` even if that file isn't shipped.

So assuming the old package had

    %config(noreplace) /etc/vimrc
The new one should have something like

    %config(missingok) /etc/vimrc
or

    %ghost %config /etc/vimrc

Currently however the first version would lead to actually installing a (potentially zero sized) file in /etc, and the %ghost form would not remove an unmodified config on update.

Any thoughts on this?

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