Two days ago, Rajon Rondo had nearly a week off for the All-Star break. Now he’s an extremely busy man. The star point guard of the Boston Celtics, added Wednesday to the Eastern Conference All-Stars as an injury replacement for Atlanta’s Joe Johnson, will also fill in for injured Stephen Curry of Golden State in the Skills Challenge on All-Star Saturday. The NBA announced the move Friday, hours before media availability begins in Orlando, Fla. Sheridan Hoops is on site and will