Add new --extract-rename option

[bluca]

Allows extracting a file and renaming it. Useful for Debian builds where the recipe file is in git, but the naming doesn't match OBS expectations: usually git stores debian/control but OBS wants debian.control. Also useful for multibuild, eg, to extract foo.spec to foo_TargetRepository.spec.

[Werkov]

Isn't this what https://github.com/openSUSE/obs-service-extract_file already does? I see you actually use it (It seems to me clearer to handle the renaming together with moving of files.)

[bluca]

Isn't this what https://github.com/openSUSE/obs-service-extract_file already does? I see you actually use it (It seems to me clearer to handle the renaming together with moving of files.)

That only works on tarballs, so you need to use tar_scm instead of obs_scm, and my understanding is that OBS admins want people to use obs_scm as it's easier on the backend and the storage