Merge pull request #62412 from bhcleek/go1.10

Automatic merge from submit-queue. 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>.

generated code should pass go vet for go1.10

**What this PR does / why we need it**:

Update code generator and the code it generates to pass `go vet`.

go1.10 runs `go vet` whenever `go test` is run. Because of this, generated code for CRDs needs to pass `go vet`.

**Release note**:

```release-note
Code generated for CRDs now passes `go vet`.
```

Kubernetes-commit: 5dde701b876d1d0915314c3ed146e986c4327f7e

vendor/k8s.io/code-generator/_examples/apiserver/apis/example/v1/doc.go

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 // +k8s:deepcopy-gen=package
+// +k8s:defaulter-gen=TypeMeta
 // +k8s:conversion-gen=k8s.io/code-generator/_examples/apiserver/apis/example
 // +groupName=example.apiserver.code-generator.k8s.io
 package v1

vendor/k8s.io/code-generator/_examples/apiserver/apis/example2/v1/doc.go

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 // +k8s:deepcopy-gen=package
+// +k8s:defaulter-gen=TypeMeta
 // +groupName=example.test.apiserver.code-generator.k8s.io
 // +k8s:conversion-gen=k8s.io/code-generator/_examples/apiserver/apis/example2
 // +groupGoName=SecondExample