pythonPackages: remove name attribute`

The `buildPython*` function computes name from `pname` and `version`.
This change removes `name` attribute from all expressions in
`pkgs/development/python-modules`.

While at it, some other minor changes were made as well, such as
replacing `fetchurl` calls with `fetchPypi`.

pkgs/development/python-modules/devpi-common/default.nix

@@ -1,9 +1,8 @@
-{ stdenv, pythonPackages }:
+{ lib, buildPythonPackage, fetchPypi, requests, py, pytest }:
 
-with pythonPackages;buildPythonPackage rec {
+buildPythonPackage rec {
   pname = "devpi-common";
   version = "3.2.3";
-  name = "${pname}-${version}";
 
   src = fetchPypi {
     inherit pname version;
@@ -17,7 +16,7 @@ with pythonPackages;buildPythonPackage rec {
     py.test
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = https://github.com/devpi/devpi;
     description = "Utilities jointly used by devpi-server and devpi-client";
     license = licenses.mit;