Nav2 Updown Test

This is a 'top level' system test which tests the lifecycle bringup and shutdown of the system.

To run the test

ros2 launch nav2_system_tests test_updown_launch.py

If the test passes, you should see this comment in the output:

[test_updown-13] [INFO] [test_updown]: ****************************************************  TEST PASSED!

To run the test in a loop 1000x, run the test_updown_reliablity script and log the output:

./test_updown_reliability |& tee /tmp/updown.log

When the test is completed, pipe the log to the updownresults.py script to get a summary of the results:

./updownresults.py < /tmp/updown.log`