Photo by Brian Fluharty/Getty Images Brad Stevens, Boston Celtics The Boston Celtics face a busy summer. Brad Stevens is expected to make multiple changes to the roster, as he looks to get the team below the second luxury tax apron. Kristaps Porzingis , Jrue Holiday and Sam Hauser are all viewed as the most logical trade chips. However, ESPN’s Shams Charania recently reported that Boston is “one hundred percent” receiving big trade offers for Derrick White and Jaylen Brown . “However, now are