get rid of deprecated rclcpp::spin_some() (#1567)

Signed-off-by: Alejandro Hernandez Cordero <[email protected]>

Author: ahcorde

rviz2/test/tools/send_lots_of_points_node.cpp

@@ -63,6 +63,9 @@ int main(int argc, char ** argv)
   msg.points.resize(width * length);
   msg.header.frame_id = "world";
 
+  rclcpp::executors::SingleThreadedExecutor executor;
+  executor.add_node(node);
+
   int count = 0;
   while (rclcpp::ok() ) {
     width++;
@@ -90,7 +93,7 @@ int main(int argc, char ** argv)
 
     pub->publish(msg);
 
-    rclcpp::spin_some(node);
+    executor.spin_some();
     loop_rate.sleep();
     if (moving) {
       ++count;