BROOKLYN — Not so long ago, what defined a tumultuous day for the Atlanta Hawks would have had something to do with ownership. Or management. Not a perp walk. So for the Hawks to do what they did Wednesday night — a gutsy road win over a probable playoff team — speaks to their fortitude as a team, a darned good team. Just hours after reserves Thabo Sefolosha and Pero Antic were released from police custody – the pair was arrested outside a