Bryan I. Schwartz was so serious about getting completely away from it all, he changed his cellphone number. “I did not watch the news, read newspapers, look at work e-mail. I was completely off the grid,” Schwartz said. “It was awesome. I just laugh out loud when I think about it now.” Some attorneys would call it crazy. Others say he’s brave. But for Schwartz, 53, a founding partner and chairman at Levenfeld, Pearlstein LLC, the decision to go on a 31-day sabbatical was a “no …