Steven Luatua commits to Bristol and draws line under All Blacks career

• Back rower extends contract to 2021• ‘There are no guarantees in international rugby’Steven Luatua has given up any hope of playing again for the All Blacks by signing a two-year contract extension with Bristol in the belief that the Bears will soon challenge for the Premiership title.The other end of the table will be on Bristol’s minds when they welcome Newcastle to Ashton Gate on Sunday. They sit two points above bottom-placed Falcons but such is the congestion below the top three that none of the other nine clubs went into this weekend’s matches, the season’s halfway point, with more vic…