(Updates with Nadal win, adds quotes) By Eric Salliot ROME, May 19 (Reuters) – Rafa Nadal made short work of his great rival Roger Federer to win the Italian Open, his sixth trophy of the year, 6-1 6-3 on Sunday. The crowd sitting in the sunshine at Rome’s Foro Italico watched Nadal race to victory in 69 minutes on the red clay. …