Rumors have always haunted Mike Piazza. The former major league star finally addresses some of them in “Long Shot,” a memoir due out soon. The New York Post has excerpts. Arguably the greatest offensive catcher in baseball history, Piazza still wasn’t a first ballot Hall of Fame choice in January — his first year of eligibility. Why? Persistent rumors that Piazza dabbled in performance enhancing drugs during his career, even though he was never directly linked to steroids.