don't error if metadata can't be set. Old versions of openstack don't seem to play nicely with this API call

builder/openstack/step_create_image.go

@@ -65,7 +65,6 @@ func (s *stepCreateImage) Run(ctx context.Context, state multistep.StateBag) mul
 				err := fmt.Errorf("Error setting image metadata: %s", err)
 				state.Put("error", err)
 				ui.Error(err.Error())
-				return multistep.ActionHalt
 			}
 		}