pythonPackages.gcutil: Deprecate the package

The package doesn't exist anymore (even the deprecation notice is gone
[0]) and the build is currently broken:
Collecting google-apputils==0.4.1 (from gcutil==1.16.1)
  Could not find a version that satisfies the requirement
google-apputils==0.4.1 (from gcutil==1.16.1) (from versions: )
No matching distribution found for google-apputils==0.4.1 (from
gcutil==1.16.1)

[0]: https://download.huihoo.com/google/gdgdevkit/DVD1/developers.google.com/compute/docs/gcutil.1.html
> "Warning: gcutil is deprecated. We encourage you to transition to
> using gcloud compute ."

pkgs/development/python-modules/gcutil/default.nix

@@ -1,41 +0,0 @@
-{ stdenv
-, buildPythonPackage
-, fetchurl
-, gflags
-, iso8601
-, ipaddr
-, httplib2
-, google_apputils
-, google_api_python_client
-, isPy3k
-}:
-
-buildPythonPackage rec {
-  name = "gcutil-1.16.1";
-  disabled = isPy3k;
-
-  src = fetchurl {
-    url = https://dl.google.com/dl/cloudsdk/release/artifacts/gcutil-1.16.1.tar.gz;
-    sha256 = "00jaf7x1ji9y46fbkww2sg6r6almrqfsprydz3q2swr4jrnrsx9x";
-  };
-
-  propagatedBuildInputs = [ gflags iso8601 ipaddr httplib2 google_apputils google_api_python_client ];
-
-  prePatch = ''
-    sed -i -e "s|google-apputils==0.4.0|google-apputils==0.4.1|g" setup.py
-    substituteInPlace setup.py \
-      --replace "httplib2==0.8" "httplib2" \
-      --replace "iso8601==0.1.4" "iso8601" \
-      --replace "ipaddr==2.1.10" "ipaddr" \
-      --replace "google-api-python-client==1.2" "google-api-python-client" \
-      --replace "python-gflags==2.0" "python-gflags"
-  '';
-
-  meta = with stdenv.lib; {
-    description = "Command-line tool for interacting with Google Compute Engine";
-    homepage = "https://cloud.google.com/compute/docs/gcutil/";
-    license = licenses.asl20;
-    maintainers = with maintainers; [ phreedom ];
-  };
-
-}

pkgs/top-level/python-packages.nix

@@ -1732,7 +1732,11 @@ in {
 
   gateone = callPackage ../development/python-modules/gateone { };
 
-  gcutil = callPackage ../development/python-modules/gcutil { };
+  # TODO: Remove after 19.03 is branched off:
+  gcutil = throw ''
+    pythonPackages.gcutil is deprecated and can be replaced with "gcloud
+    compute" from the package google-cloud-sdk.
+  '';
 
   GeoIP = callPackage ../development/python-modules/GeoIP { };