ATLANTA — R.A. Dickey was won over by an Atlanta Braves sales team that included two Hall of Famers, including a fellow knuckleballer. Dickey said he knew the Braves would be a good fit after meeting in Nashville, Tennessee, with a group that included manager Brian Snitker, general manager John Coppolella and two Hall of Famers — former manager Bobby Cox and knuckleballer Phil Niekro. “I had a great feeling then there was great hope I would be able to join the organization,” Dickey said Thursday after agreeing to a one-year contract with an $8 million guarantee.