Preparing to direct “A Journal for Jordan,” a bittersweet love story opening on Christmas Day, Denzel Washington says he took a “master class.”That master class consisted of starring in a movie directed by Joel Coen, “The Tragedy of Macbeth,” which opens the same day. “I steal from the best,” Washington says with a smile.Denzel Washington the actor has some 60 films under his belt, plus two Oscars, and at 66 is universally regarded as one of the all-time greats.