Unaffiliated voters have less than two hours to go to their town or city halls and change their affiliation to Republican or Democrat and participate in Tuesday’s primaries. So if you don’t want to stand on the sidelines while Tom Foley of Greenwich and Senate Minority Leader John McKinney of Fairfield go after each other over the GOP gubernatorial nomination, change your registration to Republican and join the fray. Deadline is noon, though, says Av Harris, spokesman for Secretary of the State Denise Merrill.