Update kubernetes projects version in vendor to 1.12.1

vendor/k8s.io/apimachinery/pkg/runtime/serializer/protobuf/protobuf.go

@@ -20,10 +20,12 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"net/http"
 	"reflect"
 
 	"github.com/gogo/protobuf/proto"
 
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/runtime/serializer/recognizer"
@@ -50,6 +52,15 @@ func (e errNotMarshalable) Error() string {
 	return fmt.Sprintf("object %v does not implement the protobuf marshalling interface and cannot be encoded to a protobuf message", e.t)
 }
 
+func (e errNotMarshalable) Status() metav1.Status {
+	return metav1.Status{
+		Status:  metav1.StatusFailure,
+		Code:    http.StatusNotAcceptable,
+		Reason:  metav1.StatusReason("NotAcceptable"),
+		Message: e.Error(),
+	}
+}
+
 func IsNotMarshalable(err error) bool {
 	_, ok := err.(errNotMarshalable)
 	return err != nil && ok