Chris Willman Music WriterKenny Wayne Shepherd is no longer a contender for this year’s Blues Music Awards, due to his continued use of Confederate flag imagery that had been — pardon the expression — flagged by upset members of the sponsoring Blues Foundation organization.Shepherd’s use of the flag is associated with a recreation of the “Dukes of Hazzard” car that he had built in the mid-2000s and dubbed the “Xtreme Lee.” Shepherd has also used the “Xtreme Lee” branding on a product line that