Use the update_payload in update_engine

Currently there are two version of the (almost) same code in
  platform/dev/host/lib/update_payload
and
  aosp/system/update_engine/scripts

This patch deletes all the update_payload scripts from the platform/dev and changes all the references to src/aosp/system/update_engine/scripts/update_payload.

BUG=chromium:737210
TEST=cbuildbot --remote
CQ-DEPEND=CL:598435,CL:598435

Change-Id: I3cee23aa3d5ace826d2d6ba669f3bbc21f0a5ac1
Reviewed-on: https://chromium-review.googlesource.com/598434
Commit-Ready: Amin Hassani <[email protected]>
Tested-by: Amin Hassani <[email protected]>
Reviewed-by: Xixuan Wu <[email protected]>
Reviewed-by: Don Garrett <[email protected]>
Reviewed-by: Mike Frysinger <[email protected]>
20 files changed