NFL news roundup: Lions sign veteran LB Zach Cunningham  NFL.comLions make Zach Cunningham signing official, waive LB to make room  Yahoo SportsDetroit Lions adding veteran linebacker prior to OTAs  Pride Of DetroitLions cut LB Abraham Beauplan to make room for LB Zach Cunningham  NBC SportsDetroit Lions Waive Linebacker Ahead of OTAs  Sports Illustrated