It's no surprise to anyone in Fat City that our town's best-known wine expert Doug Frost -- Master Sommelier and America's eighth Master of Wine -- has become a television star. In addition to lecturing and writing about wine, Frost is the host of KCPT-TV's locally produced Check Please! and a featured judge on the newest PBS reality program, The Winemakers (which kicks off a six-episode run tomorrow at 2:30 p.m.). And why shouldn't Frost be a familiar TV face -- long before