By TOM SHANAHAN MSUings on the Michigan State football upsetting No. 8-ranked Northwestern 29-20 Saturday afternoon at Spartan Stadium and the Spartans’ No. 13 basketball team defeating Notre Dame 80-70 next door in the evening at the Breslin Center. First-year coach Mel Tucker’s football Spartans improved to 2-3 with impressive play on both sides of the ball. Quarterback Rocky Lombardi threw two touchdown passes and the defense prevented the Wildcats from completing a second-half comeback that dropped Northwestern…