BUG=chromium-os:5246
TEST=below, During all tests, the directory platform/dev was manually removed
1) Ran cros_au_test_harness.py and saw it succeed
2) Ran generate_au_zip.py, compared the generated .zip with one before this
patch - they were identical
3) Ran cros_image_to_target.py and saw it succeed
Change-Id: Iab2620245a45442b79ee8369f3af1a3990f4644e
Review URL: http://codereview.chromium.org/6576023
Change-Id: Ifc47ed28dc3efc0e7ebd018f6703b36913ffd39c
BUG=8716
TEST=Ran the script inside the chroot to makesure it is generating the package.
Review URL: http://codereview.chromium.org/4425004