This allows the command wrappers to delete files if the command
fails. In particular, it delets empty or otherwise useless files
that are generated if a non-fatal command fails.
Change-Id: If26d7b4d7500f160edd1cc2a8b6218792fefae8b
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/4050
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>