Dallas Stars general manager Jim Nill had a busy day before his team officially opens training camp on Wednesday morning. He signed Esa Lindell to a contract extension, a five-year deal with a cap hit of $5.2 million annually. He was entering the last year of a six-year deal that carried a cap hit of $5.8 million. The new deal all but guarantees that Lindell will be a Star for pretty much the…