Remove cluster/test-network.sh

To fix this, it would be an alias for:

  hack/ginkgo-e2e.sh -t TestNetwork

... which may not work on binary distributions, because it's relying
on test assets, so it probably shouldn't live in cluster/ ...

cluster/test-network.sh

@@ -1,23 +0,0 @@
-#!/bin/bash
-
-# Copyright 2014 Google Inc. All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set -o errexit
-set -o nounset
-set -o pipefail
-
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
-
-exec "${KUBE_ROOT}/hack/e2e-suite/goe2e.sh" -t TestNetwork