LOS ANGELES — A jubilant Ava DuVernay was named entertainer of the year at an NAACP Image Awards ceremony that focused on the black community’s power to create change. DuVernay lauded other black artists from the stage as she accepted her award Monday night, naming writers and directors such as Shonda Rhimes, Gina Prince-Bythewood, Kenya Barris and “Black Panther” Ryan Coogler. “This is our time,” DuVernay said.