pythonPackages.azure-mgmt-relay: fix python3 namespace

pkgs/development/python-modules/azure-mgmt-relay/default.nix

@@ -1,6 +1,8 @@
 { lib
 , buildPythonPackage
 , fetchPypi
+, python
+, isPy3k
 , msrestazure
 , azure-common
 , azure-mgmt-nspkg
@@ -22,6 +24,11 @@ buildPythonPackage rec {
     azure-mgmt-nspkg
   ];
 
+  postInstall = lib.optionalString isPy3k ''
+    rm $out/${python.sitePackages}/azure/__init__.py
+    rm $out/${python.sitePackages}/azure/mgmt/__init__.py
+  '';
+
   # has no tests
   doCheck = false;