Motor racing-Ecclestone shocked by Rosberg retirement, backs Alonso

By Alan Baldwin LONDON, Dec 2 (Reuters) - World champion Nico Rosberg's retirement announcement on Friday came as a complete surprise even to the man who knows most of Formula One's best-kept secrets, commercial supremo Bernie Ecclestone. "It was just as big a shock to me as you," he told Reuters by telephone after Rosberg dropped the bombshell days after securing his first championship in last Sunday's Abu Dhabi season-ender. "I had dinner with (Mercedes team boss) Toto (Wolff) last night and h