This blond, poster boy actor will always be recalled for playing Bo Duke, one of three mischievous cousins, on the back-country comedy "The Dukes of Hazzard" (CBS, 1979-85). John Schneider has managed to keep an ongoing career, branching out into singing, particularly country music, and recording 11 albums, as well as starring in TV-movies and several failed series. Born and raised in Mount Kisco , New York, Schneider was an unknown when he was discovered by "Dukes" creator Phil Mandelker and given the role of Bo. Although considered the most low-brow program on TV at the time, the CBS effort