sync to latest ros2 code, the ros2 launch not work.
May caused by this commit: ros2/rcl_interfaces@852a37b

$ ros2 launch
Failed to load entry point 'launch': type object 'Transition' has no attribute 'TRANSITION_SHUTDOWN'
usage: ros2 [-h] Call ros2 <command> -h for more detailed usage. ...
ros2: error: argument Call ros2 <command> -h for more detailed usage.: invalid choice: 'launch' (choose from 'daemon', 'extension_points', 'extensions', 'lifecycle', 'msg', 'node', 'param', 'pkg', 'run', 'security', 'service', 'srv', 'topic')

$ ros2 -h
Failed to load entry point 'launch': type object 'Transition' has no attribute 'TRANSITION_SHUTDOWN'
usage: ros2 [-h] Call ros2 <command> -h for more detailed usage. ...

ros2 is an extensible command-line tool for ROS 2.

optional arguments:
-h, --help show this help message and exit

Commands:
daemon Various daemon related sub-commands
lifecycle Various lifecycle related sub-commands
msg Various msg related sub-commands
node Various node related sub-commands
param Various param related sub-commands
pkg Various package related sub-commands
run Run a package specific executable
security Various security related sub-commands
service Various service related sub-commands
srv Various srv related sub-commands
topic Various topic related sub-commands

Call ros2 <command> -h for more detailed usage.