Update to 2.0.3 (#1316101).
    
    Also,
    - Use the python_provides macro and rename python-paste to
      python2-paste.
    - Drop conditionals on building python3-paste.
    - Use the license macro.
    - Dropped py3 fixes patch, since it is included in the upstream
      2.0.3 release.
    - Update URL, since old one doesn't load anymore.
    - Reorganize spec file.
    - Don't rm the buildroot before install.
    - Drop some .orig files.
    - Add BuildRequires on six.
    - Drop unneeded clean section.
    - Drop unneeded defattr in the files sections.
    - Don't use * to select files in the Python sitelib, list them
      explicitly.