NEW YORK (Reuters) – Quarterback Michael Vick has been reinstated to the NFL on a conditional basis and a decision on his return to action will come by the sixth week of the regular season, Commissioner Roger Goodell said Monday. Vick, who completed a 23-month criminal sentence for bankrolling a dogfighting ring, was free to sign with an NFL team, participate in practice and play in the final two preseason games. A decision on his return to regular-season competition would be based on the progre