Chicago police officers were justified in using deadly force to prevent the escape of a driver who had just fled the scene of a drive-by shooting, a federal judge ruled on Friday.U.S. District Judge Virginia M. Kendall granted summary judgment to the Chicago police officers — Francis A. Valadez and Monica Reyes — who were sued by the man’s mother, Rachel Ybarra.Ybarra filed a lawsuit against the city and its two police officers that alleged excessive force and wrongful death after her son, Rafael Cruz …