Fix problem on generate payload.

  - new accessory directory under scripts/keygeneration, use cp -r to
    copy
  - silent the warning when unmount chromium image.

BUG=b:62703887
TEST=Manually

Change-Id: Iac9e01cea5e5e36aa8a4f49b9f20ed1503173efd
Reviewed-on: https://chromium-review.googlesource.com/544220
Commit-Ready: danny chan <dchan@chromium.org>
Tested-by: danny chan <dchan@chromium.org>
Reviewed-by: Tyler Reid <twreid@google.com>
1 file changed