NEW YORK — “Saturday Night Live” alum Chris Redd suffered a gnarly, bloody wound when he was sucker-punched by a stranger outside a Greenwich Village comedy club, witnesses said. “They really bashed the poor guy,” said Fabrizio Caballacci, whose family has owned Caffe Reggio on MacDougal Street since the 1950s. “He was bleeding a lot. There was blood all over the sidewalk.” A stranger wearing some type of security uniform and a baseball cap ran up and struck the 37-year-old stand-up comedian in the face as he exited a car outside the Comedy Cellar on MacDougal Street near Minetta Lane in Green…