Currently the Python portions of tf2_kdl are commented out: https://github.com/ros2/geometry2/pull/90/files#diff-61737c5a9ef69ef2118eafbc59732b6aR21 . This is because at the time the tf2_kdl port was done, the tf2_py package was not yet ported (see #99). Once that is done, we can finish the port of the tf2_kdl python portions.

@mlautman has additional followup tasks (mostly around the python) in #90 (comment), which should be completed when we complete the python port.