(By Ely Portillo, elyportillo@charlotteobserver.com) Mooresville-based home improvement retailer Lowe's Inc. said Monday that it is streamlining and consolidating the company's upper management, as the company trails Home Depot in most recent performance measures.Three senior vice presidents, Theresa Anderson, Robert Wagner and Patricia Price, are leaving the company as a result of the changes, Lowe's said.