* Scott signed to multi-year contract * Takes charge of a team in rebuilding phase (Adds detail, quotes, byline) By Mark Lamport-Stokes LOS ANGELES, July 28 (Reuters) - The Los Angeles Lakers appointed former player Byron Scott as their new head coach on Monday, bringing an end to their "extensive and thorough" search for Mike D'Antoni's replacement. Scott, 53, was a three-time NBA champion with ...