python2Packages: remove superfluous overrides

Since Python 2 is not supported anymore we only keep those overrides
which are used by leaf packages.

pkgs/development/python-modules/notebook/2.nix

@@ -1,76 +0,0 @@
-{ stdenv
-, lib
-, buildPythonPackage
-, fetchPypi
-, nose
-, nose_warnings_filters
-, glibcLocales
-, isPy3k
-, mock
-, jinja2
-, tornado
-, ipython_genutils
-, traitlets
-, jupyter_core
-, jupyter-client
-, nbformat
-, nbconvert
-, ipykernel
-, terminado
-, requests
-, send2trash
-, pexpect
-, prometheus-client
-}:
-
-buildPythonPackage rec {
-  pname = "notebook";
-  version = "5.7.10";
-
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "b10107e1438e7a564292aa32510e610c88844cae03c882fe5286b891792b5c11";
-  };
-
-  LC_ALL = "en_US.utf8";
-
-  checkInputs = [ nose glibcLocales ]
-    ++ (if isPy3k then [ nose_warnings_filters ] else [ mock ]);
-
-  propagatedBuildInputs = [
-    jinja2 tornado ipython_genutils traitlets jupyter_core send2trash
-    jupyter-client nbformat nbconvert ipykernel terminado requests pexpect
-    prometheus-client
-  ];
-
-  # disable warning_filters
-  preCheck = lib.optionalString (!isPy3k) ''
-    echo "" > setup.cfg
-  '';
-
-  postPatch = ''
-    # Remove selenium tests
-    rm -rf notebook/tests/selenium
-
-  '';
-
-  checkPhase = ''
-    runHook preCheck
-    mkdir tmp
-    HOME=tmp nosetests -v ${if (stdenv.isDarwin) then ''
-      --exclude test_delete \
-      --exclude test_checkpoints_follow_file
-    ''
-    else ""}
-  '';
-
-  # Some of the tests use localhost networking.
-  __darwinAllowLocalNetworking = true;
-
-  meta = {
-    description = "The Jupyter HTML notebook is a web-based notebook environment for interactive computing";
-    homepage = "https://jupyter.org/";
-    license = lib.licenses.bsd3;
-    maintainers = with lib.maintainers; [ ];
-  };
-}