completely shutdown inital_pose_sub_ (#4176)

Signed-off-by: GoesM <GoesM@buaa.edu.cn>
Co-authored-by: GoesM <GoesM@buaa.edu.cn>

nav2_amcl/src/amcl_node.cpp

@@ -326,6 +326,7 @@ AmclNode::on_cleanup(const rclcpp_lifecycle::State & /*state*/)
  // don't continue to process incoming messages
  global_loc_srv_.reset();
  nomotion_update_srv_.reset();
+ executor_thread_.reset(); // to make sure initial_pose_sub_ completely exit
  initial_pose_sub_.reset();
  laser_scan_connection_.disconnect();
  laser_scan_filter_.reset();