Remove temporary directory after building factory toolkit

This fixes a bug that the temporary directory is left at the output
path after a factory toolkit is built.

BUG=chrome-os-partner:24798
TEST=Build factory toolkit and check temporary directory is deleted.

Change-Id: I907a0efab10b7566eef67ff82c022b5139223a4b
Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/183900
Reviewed-by: Jon Salz <jsalz@chromium.org>
1 file changed