WRAPUP 1-Soccer-Barca stunned by Celtic as United reach last 16

* Barca beaten 2-1 but remain top * United battle back to down Braga 3-1 * Holders Chelsea leave it late to edge Shakhtar (Adds quotes, details) LONDON, Nov 7 (Reuters) – Barcelona wasted their first chance to reach the Champions League last 16 after a su...