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

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

@@ -28,9 +28,7 @@ func (in *RawExtension) DeepCopyInto(out *RawExtension) {
 		*out = make([]byte, len(*in))
 		copy(*out, *in)
 	}
-	if in.Object == nil {
-		out.Object = nil
-	} else {
+	if in.Object != nil {
 		out.Object = in.Object.DeepCopyObject()
 	}
 	return
@@ -83,9 +81,7 @@ func (in *VersionedObjects) DeepCopyInto(out *VersionedObjects) {
 		in, out := &in.Objects, &out.Objects
 		*out = make([]Object, len(*in))
 		for i := range *in {
-			if (*in)[i] == nil {
-				(*out)[i] = nil
-			} else {
+			if (*in)[i] != nil {
 				(*out)[i] = (*in)[i].DeepCopyObject()
 			}
 		}