John Cena is happy to be home
John Cena is happy to be home, if only briefly. The West Newbury-bred beefcake was body-slamming in front of a lot of family and friends at last night’s WWE RAW SuperShow at TD Garden. But he wasn’t all smiles. Talking to us beforehand about his bitter rival Dwayne “The Rock’’ Johnson , who was at the Garden to promote a big WWE event Sunday at Madison Square Garden, Cena snarled. . .