add spelling checking script

hack/.spelling_failures

+BUILD
+CHANGELOG
+OWNERS
+api.pb.go
+api.proto
+docs/api-reference
+docs/man
+docs/user-guide
+generated.pb.go
+generated.proto
+pkg/client/clientset_generated
+pkg/client/informers/informers_generated/
+pkg/generated
+swagger
+test/e2e/generated
+third_party/
+translations/
+vendor/
+zz_generated

hack/make-rules/verify.sh

@@ -45,6 +45,7 @@ QUICK_PATTERNS+=(
   "verify-imports.sh"
   "verify-pkg-names.sh"
   "verify-readonly-packages.sh"
+  "verify-spelling.sh"
   "verify-staging-client-go.sh"
   "verify-test-images.sh"
   "verify-test-owners.sh"

hack/verify-spelling.sh

+#!/usr/bin/env bash
+# Copyright 2018 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.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+export KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+source "${KUBE_ROOT}/hack/lib/init.sh"
+
+# Install tools we need, but only from vendor/...
+cd ${KUBE_ROOT}
+go install ./vendor/github.com/client9/misspell/cmd/misspell
+if ! which misspell >/dev/null 2>&1; then
+    echo "Can't find misspell - is your GOPATH 'bin' in your PATH?" >&2
+    echo "  GOPATH: ${GOPATH}" >&2
+    echo "  PATH:   ${PATH}" >&2
+    exit 1
+fi
+
+# Spell checking
+# All the skipping files are defined in hack/.spelling_failures
+skipping_file="${KUBE_ROOT}/hack/.spelling_failures"
+failing_packages=$(echo `cat ${skipping_file}` | sed "s| | -e |g")
+git ls-files | grep -v -e ${failing_packages} | xargs misspell -i "Creater,creater,ect" -error -o stderr