add header linter to avoid license header mistakes (#1414)

Co-authored-by: Daniel Valdivia <18384552+dvaldivia@users.noreply.github.com>

hack/update-codegen.sh

@@ -1,18 +1,4 @@
 #!/bin/bash
-#
-# Copyright 2020 Google LLC
-#
-# 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
-#
-#     https://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
@@ -20,10 +6,7 @@ set -o pipefail
 
 SCRIPT_ROOT=$(dirname ${BASH_SOURCE})/..
 
-go get -d k8s.io/code-generator/...
-
-# Checkout code-generator to compatible version
-#(cd $GOPATH/src/k8s.io/code-generator && git checkout origin/release-1.14 -B release-1.14)
+GO111MODULE=off go get -d k8s.io/code-generator/...
 
 REPOSITORY=github.com/minio/console
 $GOPATH/src/k8s.io/code-generator/generate-groups.sh all \