am f2521e76: Merge changes I46586cba,I6c500ab5,I2f7d9934

* commit 'f2521e76ffd5baaf13f7ddf16bcc0ef58959cfae':
  Add mknod utility to system/core/toolbox
  Getevent: make sure the monotonic timestamp is displayed; warning cleanup.
  toolbox: Add nohup command