Media mogul Barry Diller pounced on one of Manhattan’s most storied addresses, snagging President John F. Kennedy’s onetime favorite penthouse for $11 million. Diller, 84, has lived at the Carlyle Hotel for 30 years. So when the crown jewel of the building hit the market — the very penthouse where John F. Kennedy practically ran the country between Washington trips — he wasn’t about to let it slip away. “I’ve lived happily at the Carlyle for over 30 years, and when the penthouse came up I