Fix various raw_config issues.
    
    - If `config.raw_config_pungi_koji_args` is not defined, fallback to
      `conf.pungi_koji_args`.
    - Do not use `--target-dir` together with `--compose-dir`. Newer Pungi
      does not allow it.
    - Generate `composeinfo-base.json` describing the compose we are going
      to generate. Pungi needs that file to exist in compose-dir.