Cleanup .spec file
    
    as suggested by Parag Nemade <pnemade@redhat.com>:
    
    - python site_arch macro is not needed now, remove it
    - remove buildroot tag
    - Add comment/bz reference for patch
    - removal of buildroot in %install
    - remove %clean section
    - remove defattr(-,root,root,-)
    - Add PKG-INFO to %doc
    - BuildRequires should be python2-devel and not just python-devel