MINNEAPOLIS — Adrian Peterson was reinstated by the NFL in April. He rejoined the Minnesota Vikings in June. He even got a new contract in July with the guaranteed money he was seeking.From the league’s view, then, there should be no further dispute about the application of the personal conduct policy related to Peterson’s punishment last season.The situation turned out all right for the star running back, now that he’s back on the field.For the NFL Players Association, there are still legal …