The Boston Celtics don’t have as many pending free agents this summer as they did a year ago. Last season, they made significant trades to clear money off the books. They traded two starters in order to get under the second apron of the luxury tax.In the middle of the year, they traded Anfernee Simons to get under the luxury tax in general. Now, they are trying to avoid getting into the luxury tax this year, regardless of what happens with Jayle…