Joan Kennedy received no special treatment by being placed on a year's probation and losing her driver's license for 120 days for drunken driving, a prosecutor says. The 51-year-old former wife of Sen. Edward M. Kennedy, D-Mass., also was ordered to pay $677 in fees and fines and to participate in a state alcohol-education program. The penalty, imposed Tuesday by Barnstable (Mass.) District Court Judge Joseph T. Travaline, was part of an agreement between the district attorney's office and Mrs. Kennedy's attorney.