Make TimeSource ignore use_sim_time events coming from other nodes. (#799)
Make TimeSource ignore use_sim_time events coming from other nodes. (#799)

Signed-off-by: Michel Hidalgo <2c7f9fd20fbeb41ce8894ec4653d66fa7f3b6e1a@ekumenlabs.com>
ros2/rclcpp,ros2/rclcpp