am 47c1d734: Merge change 4051 into donut

Merge commit '47c1d7344ab183f5440843f6b594d1b74a2335b0'

* commit '47c1d7344ab183f5440843f6b594d1b74a2335b0':
  vold: Give logwrapper the ability to put jobs into the background sched group.