Tracking the movements and insights of film sales agents – especially in the indie market – is about as inside baseball as it gets in Hollywood. They are hardline negotiators, wining and dining, cajoling and haggling to get filmmakers and producers the best deal possible.    Those agents also happen to be some of the most press-averse figures in the industry (it’s  always  about the client). But  Variety  managed to pin down Rena Ronson , who has led UTA ’s premium indie sales outfit for almost