The Las Vegas Raiders personnel department spent countless hours poring over scouting reports and studying tape in preparation for their 10 picks in the NFL draft. They must have really liked the film of the Arizona secondary. The Raiders followed up Friday’s selection of Wildcats defensive back Treydan Stukes by picking Arizona safety Dalton Johnson in the fifth round on Saturday. “I’m super excited,” Johnson said. “That’s my boy. We’re best friends. Being drafted is one thing, but being drafted to a team that I get to go somewhere with my best friend and continue this ‘Bear Down’ brotherhood, I’m super excited and ready to take that leadership and turn Las Vegas up.” The Raiders made several trades to move up and back on the board, giving up a pick in one deal and acquiring one in another. They also traded away former top-10 pick Tyree Wilson and eventually ended up right back with 10 selections, the same amount with which they started the process.…