Update RHEL dependency package list  (#655)
Update RHEL dependency package list  (#655)

The pydocstyle and lttng python packages recently became available in
EPEL 8, so I re-ran the rosdep command to see if there were any other
packages that we've been missing. Turns out there were a decent amount!

Signed-off-by: Scott K Logan <8c724d14625be4be480086a9212b212477a303ef@cottsay.net>
ros2/ci,ros2/ci,ros2/ci