Move namePrefix="" python packages out of python-packges.nix

It doesn't make sense to build tools/applications with three different
python interpreter versions, so move them out of python modules list.

Also reverts 53ffc6e0ef.

pkgs/tools/admin/awscli/default.nix

@@ -0,0 +1,18 @@
+{ stdenv, fetchurl, pythonPackages }:
+
+pythonPackages.buildPythonPackage rec {
+  name = "awscli-${version}";
+  version = "0.8.3";
+  namePrefix = "";
+
+  src = fetchurl {
+    url = "https://github.com/aws/aws-cli/archive/${version}.tar.gz";
+    sha256 = "0v7igh00zja560v8qz315g3m7x9six1hprrrb10cpp9sy8n58xnn";
+  };
+
+  propagatedBuildInputs = [ 
+    pythonPackages.argparse
+    pythonPackages.botocore
+    pythonPackages.colorama
+  ];
+}