Update vendor files to point to kubernetes-1.12.0-beta.1

vendor/k8s.io/apimachinery/pkg/watch/zz_generated.deepcopy.go

@@ -23,9 +23,7 @@ package watch
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *Event) DeepCopyInto(out *Event) {
 	*out = *in
-	if in.Object == nil {
-		out.Object = nil
-	} else {
+	if in.Object != nil {
 		out.Object = in.Object.DeepCopyObject()
 	}
 	return