Enable validation-gen on core/v1

This enables generation but does not activate the strategy calling of
declarative.

Author: thockin

pkg/apis/core/v1/doc.go

@@ -18,6 +18,8 @@ limitations under the License.
 // +k8s:conversion-gen-external-types=k8s.io/api/core/v1
 // +k8s:defaulter-gen=TypeMeta
 // +k8s:defaulter-gen-input=k8s.io/api/core/v1
+// +k8s:validation-gen=TypeMeta
+// +k8s:validation-gen-input=k8s.io/api/core/v1
 
 // Package v1 is the v1 version of the API.
 package v1