Alex Boone also skips mandatory minicamp

49ers tight end Vernon Davis kept everyone guessing about whether he’d show up for a mandatory minicamp.  49ers guard Alex Boone didn’t. With no mixed messages or conflicting signals, Boone didn’t show up for the team’s mandatory three-day minicamp, according to Matt Maiocco of CSNBayArea.com. Both Davis and Boone skipped the team’s voluntary offseason workouts,…