Add license to Python distutils module description

Fixes: #1236

python/setup.py.in

@@ -45,6 +45,7 @@ setup(name='@PACKAGE_NAME@',
       description='Python bindings for @PACKAGE_NAME@',
       maintainer_email='@PACKAGE_BUGREPORT@',
       url='http://www.rpm.org/',
+      license='GNU General Public License v2',
       packages=['@PACKAGE_NAME@'],
       ext_modules=[rpmmod]
      )