By Jonathan Stempel (Reuters) – A Florida jury found Tesla Inc 1% negligent in the death of an 18-year-old man whose Model S sedan slammed into a concrete wall, with the teenager and his father 99% at fault. Monday’s verdict by a Fort Lauderdale federal jury came in what lawyers for the teenager’s parents James and Jenny Riley called the first trial against Elon Musk’s company over an accident involving its vehicles. Jurors found Tesla negligent for deactivating a “speed limiter” that the parents had installed to keep their son Barrett from driving too fast. Barrett Riley was driving at 116 mi…