BOSTON — Jury summonses have been flying, police have been deploying and the news media has been scrambling like seldom before as two highly anticipated criminal trials get underway almost simultaneously in Massachusetts — the federal death penalty trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev and the murder trial of former New England Patriots star Aaron Hernandez. The trials began last week within days of each other, competing for jurors, security, headlines and the public’s attention. …