Fix build on foxy and remove unused dependencies

[emersonknapp]

The std::move call in odometry.cpp caused build error against Foxy

odometry.cpp:135:19: error: moving a local object in a return statement prevents copy elision [-Werror=pessimizing-move] 

Additionally, removing exec_depends that aren't used (and cause build issues right now)

• diagnostic_aggregator - there are not yet ros2 launchfiles in this project, therefore this isn't really a runtime dependency yet
• kobuki_ftdi - all of the kobuki communication is handled by the kobuki_driver dependency chain
• kobuki_keyop - the driver node should not know about teleop as a mandatory dependency (also not used anywhere yet)
• kobuki_safety_controller - not used anywhere

[stonier]

LGTM.