RAISIN CAINRecording information: The Schoolhouse. Johnny Winter begins Raisin' Cain, his ninth studio album since signing to CBS Records in 1969 (his records are now issued on the Blue Sky subsidiary), with "The Crawl," a rock & roll dance tune, and he ends it with "Walkin' Slowly," which employs a Fats Domino style New Orleans rhythm and the saxophone work of Tom Strohman. The two songs serve to reinforce Winter's allegiance to his roots in '50s rock, which