* rewrite dockerfile to multiple stage build

* add verification scripts

Signed-off-by: Jeff <jeffzhang@yunify.com>

hack/tools/tools.go

@@ -0,0 +1,36 @@
+/*
+Copyright 2019 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.
+*/
+
+// Package tools is used to track binary dependencies with go modules
+// https://github.com/golang/go/wiki/Modules#how-can-i-track-tool-dependencies-for-a-module
+package tools
+
+import (
+	// linting tools
+	_ "github.com/client9/misspell/cmd/misspell"
+	_ "github.com/golangci/golangci-lint/cmd/golangci-lint"
+	_ "github.com/google/go-flow-levee/cmd/levee"
+	_ "honnef.co/go/tools/cmd/staticcheck"
+	_ "k8s.io/klog/hack/tools/logcheck"
+
+	// benchmarking tools
+	_ "github.com/cespare/prettybench"
+	_ "gotest.tools"
+	_ "gotest.tools/gotestsum"
+
+	// dependencies
+	_ "sigs.k8s.io/zeitgeist"
+)