By Wilton Jackson The Dolphins first-year coach is focused on preparing his team for its preseason opener against Tampa Bay. Dolphins head coach Mike McDaniel appears solely focused on preparing his team for its preseason opener against the Buccaneers as the two teams hold joint practices this week. However, the joint sessions start more than a week after the NFL released its findings in the investigation into Miami’s allegations of tampering and tanking. The NFL’s investigation revealed that the Dolphins tampered with three teams: the Patriots, Buccaneers and Saints. The league found that Mia…