By Fernando Kallas VILLARREAL, Spain (Reuters) -Liverpool survived a first-half scare to reach the Champions League final with a 3-2 win at Villarreal on Tuesday, for a 5-2 aggregate victory, after the night had threatened to turn sour for Juergen Klopp’s side. The visitors fell 2-0 down with an insipid first-half performance before fighting back with three goals in a 12-minute spell after the break to advance to their third European Cup final in five seasons. The Premier League side had won 2-0 in England but looked in danger of coming unstuck on a rain-soaked pitch in Spain, as the hosts peg…