* Real Madrid into last eight with 2-1 Old Trafford win * Match turns after United winger Nani harshly sent off * Real substitute Modric and Ronaldo on target (Writes through, adds new quotes) MANCHESTER, England, March 5 (Reuters) - Cristiano Ronaldo dealt his former club Manchester United a cruel blow by scoring the goal that put Real Madrid into the Champions League quarter-finals after the hosts were left distraught by Nani's harsh dismissal. ... More...