McNeese head football coach Matt Viator never played for or coached under Bobby Keasler. Didn’t matter. Like virtually everyone involved in the Cowboys’ program over the last 36 years, Viator could always sense the Keasler legacy, feel his presence on the field, in the football offices, in the community. Keasler, who died Tuesday night at the age of 80, finished his nine-year McNeese career (1990-98) as the Cowboys all-time winningest coach (78-…