ceph: modern python build system invocation

ceph-python.pkgs.buildPythonPackage {

  pname = "ceph-common";

  format = "setuptools";

  inherit (ceph-src) version;

  src = ceph-src;

  pyproject = true;

  sourceRoot = "${ceph-src.name}/src/python-common";

  propagatedBuildInputs = with ceph-python.pkgs; [

  build-system = with ceph-python.pkgs; [

    setuptools

  ];

  dependencies = with ceph-python.pkgs; [

    pyyaml

  ];