Fedora Packaging: Stop using deprecated python setup.py build/install command in the spec

Source: RH [Bug 2378535](https://bugzilla.redhat.com/show_bug.cgi?id=2378535) - clustershell: Stop using deprecated python setup.py build/install command in the spec

See also: https://fedoraproject.org/wiki/Changes/DeprecateSetuppyMacros