spec: it should really follow guidelines
* License is actually GPLv2+, not GPLv2
* New packaging guidelines require to have python2 and python3 subpkgs
* Usage of %python_provide macro
* Drop unneded BR: pythonX-setuptools, we use distutils
* Drop wron requires on python/python3, RPM requires python(abi) internally
* Don't copy-paste sources 2 times for py2/py3 as it is pointless
* Use %license tag for license
* Use modern macroses like %pyX_build, %pyX_install
* Run test-suite in %check
* Drop obsolete %clean section
* Define rpmfluff as %global
Signed-off-by: Igor Gnatenko <ignatenko@redhat.com>