fixed glob command to correctly find launch files (ros2#1042)

* fixed glob command to correctly find launch files

tested on nvidia jetson xavier, ubuntu 18.04, ros2 eloquent

Signed-off-by: Chris Lalancette <[email protected]>
Co-authored-by: Chris Lalancette <[email protected]>

Author: PhilippPolterauer

source/Tutorials/Developing-a-ROS-2-Package.rst

@@ -117,7 +117,7 @@ and a ``setup.py`` file that looks like:
            # Include our package.xml file
            (os.path.join('share', package_name), ['package.xml']),
            # Include all launch files.
-           (os.path.join('share', package_name, 'launch'), glob('*.launch.py'))
+           (os.path.join('share', package_name, 'launch'), glob(os.path.join('launch', *.launch.py'))),
        ],
        # This is important as well
        install_requires=['setuptools'],