With a June 1 opt-out date looming, veteran reliever Tommy Kahnle is expected to look for a new team if he isn’t added to Boston’s roster, reports Chris Cotillo of MassLive.com. This is the second time Boston has faced a roster decision with the right-hander, who triggered an upward mobility clause on May 1, but ultimately remained in the minors with the organization. Kahnle has been excellent at Triple-A this year. The 36-year-old has allowed j…