Merge pull request #67178 from cblecker/cfssl

Automatic merge from submit-queue (batch tested with PRs 66602, 67178, 67207, 67125, 66332). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Vendor cfssl/cfssljson utilities

**What this PR does / why we need it**:
Vendors the `cfssl` and `cfssljson` tools. Updates `kube::util::ensure-cfssl` to use them.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
fixes #66995, fixes #60070

**Special notes for your reviewer**:
1. Add cfssl/cfssljson ot the required bins for saving
2. Manually cloned/checked out the new dependencies to my gopath. `godep restore` doesn't pull them down because they aren't required or already in the `Godeps.json`. Used @BenTheElder's list here: https://github.com/kubernetes/kubernetes/issues/66995#issuecomment-410594532
3. `hack/godep-save.sh` to add the packages and dependencies to godep
4. Fixed two bugs when building:
  a. `golang.org/x/crypto` needed to be updated
  b. `github.com/cloudflare/cfssl` needed to be updated to https://github.com/cloudflare/cfssl/commit/56268a613adfed278936377c18b1152d2c4ad5da so we can vendor their fork of `crypto/tls`, as we discard their modified vendored stdlib.
5. Update staging godeps
6. Update the `kube::util::ensure-cfssl` to install from vendor

**Release note**:
```release-note
NONE
```

Kubernetes-commit: 818e632c1fde5fb01bc8ccf9b9ee6201f33a28b4

vendor/k8s.io/code-generator/cmd/register-gen/main.go

@@ -0,0 +1,52 @@
+/*
+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.
+*/
+
+package main
+
+import (
+	"flag"
+	"path/filepath"
+
+	"github.com/golang/glog"
+	"github.com/spf13/pflag"
+
+	generatorargs "k8s.io/code-generator/cmd/register-gen/args"
+	"k8s.io/code-generator/cmd/register-gen/generators"
+	"k8s.io/code-generator/pkg/util"
+	"k8s.io/gengo/args"
+)
+
+func main() {
+	genericArgs := generatorargs.NewDefaults()
+	genericArgs.GoHeaderFilePath = filepath.Join(args.DefaultSourceTree(), util.BoilerplatePath())
+	genericArgs.AddFlags(pflag.CommandLine)
+	flag.Set("logtostderr", "true")
+	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
+
+	pflag.Parse()
+	if err := generatorargs.Validate(genericArgs); err != nil {
+		glog.Fatalf("Error: %v", err)
+	}
+
+	if err := genericArgs.Execute(
+		generators.NameSystems(),
+		generators.DefaultNameSystem(),
+		generators.Packages,
+	); err != nil {
+		glog.Fatalf("Error: %v", err)
+	}
+	glog.V(2).Info("Completed successfully.")
+}