am 8143be8d: Update device admin example to wipe SD card.

Merge commit '8143be8d0348e4918ccc75e0a44e617c295da2fc' into gingerbread-plus-aosp

* commit '8143be8d0348e4918ccc75e0a44e617c295da2fc':
  Update device admin example to wipe SD card.