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.