Cleanup test name (#2295)

Author: christophfroehlich

controller_manager/test/test_ros2_control_node_launch.py

@@ -133,7 +133,7 @@ def test_check_if_msgs_published(self):
 
 @launch_testing.post_shutdown_test()
 # These tests are run after the processes in generate_test_description() have shutdown.
-class TestDescriptionCraneShutdown(unittest.TestCase):
+class TestShutdown(unittest.TestCase):
 
     def test_exit_codes(self, proc_info):
         """Check if the processes exited normally."""