CI Regression: test_tutorial_parameter_events

[mjcarroll]

Bug report

Required Info:

• Operating System:
  • All platforms
• Installation type:
  • Both
• Version or commit hash:
  • main
• DDS implementation:
  • Connext
• Client library (if applicable):
  • rclcpp

Example failed build (Linux Debug): https://ci.ros2.org/view/nightly/job/nightly_linux_debug/1868/

[test_executable_0-1] Parameter event:
[test_executable_0-1]  new parameters:
[test_executable_0-1]  changed parameters:
[test_executable_0-1]   bar
[test_executable_0-1]  deleted parameters:
[test_executable_0-1] 
[INFO] [test_executable_0-1]: process has finished cleanly [pid 376167]
[INFO] [python3-2]: sending signal 'SIGINT' to process[python3-2]
[INFO] [python3-2]: process has finished cleanly [pid 376169]
FAIL

======================================================================
FAIL: test_processes_output (demo_nodes_cpp.TestExecutablesTutorial)
Test all processes output against expectations.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/jenkins-agent/workspace/nightly_linux_debug/ws/build/demo_nodes_cpp/test_parameter_events__rmw_connext_cpp_Debug.py", line 55, in test_processes_output
    proc_output.assertWaitFor(
  File "/home/jenkins-agent/workspace/nightly_linux_debug/ws/install/launch_testing/lib/python3.8/site-packages/launch_testing/io_handler.py", line 146, in assertWaitFor
    assert success, 'Waiting for output timed out'
AssertionError: Waiting for output timed out