remove hack/test-cmd.sh: make is the main build tool

hack/test-cmd.sh

-#!/bin/bash
-
-# Copyright 2016 The Kubernetes Authors.
-#
-# 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.
-
-# This script is a vestigial redirection.  Please do not add "real" logic.
-
-set -o errexit
-set -o nounset
-set -o pipefail
-
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
-
-# For help output
-ARGHELP=""
-if [[ "$#" -gt 0 ]]; then
-    ARGHELP=""
-fi
-
-echo "NOTE: $0 has been replaced by 'make test-cmd'"
-echo
-echo "The equivalent of this invocation is: "
-echo "    make test-cmd ${ARGHELP}"
-echo
-echo
-make --no-print-directory -C "${KUBE_ROOT}" test-cmd