CHICAGO — This time, Clayton Kershaw’s back was no problem. The Dodgers told him they had it. This time, the streets in Wrigleyville were clear, and the bus was able to leave without human barricades. This time, Kiké Hernandez drew the ace of hearts, and took his turn among the rotation of saviors with a home run, a grand slam and another home run. Why was this the Dodgers’ time? Forget the 29-year drought that has deprived a generation of L.A. fans of deep Octobers.