bisect-kit: add android prebuilt bisector (for chromeos arc)

bisector: bisect_android_build_id.py
switcher: switch_arc_prebuilt.py

BUG=chromium:776314
TEST=unittest and following commands

(Stupid example, to find the first version not begining with 466)
$ ./bisect_android_build_id.py init --old 4667159 --new 4678458 --dut samus-dut
$ ./bisect_android_build_id.py config switch ./switch_arc_prebuilt.py
$ ./bisect_android_build_id.py config eval bash -c \
      "ssh $DUT cat /etc/lsb-release | grep ARC_VERSION=.*_466"
$ ./bisect_android_build_id.py run

Change-Id: Ib06a21a85e05ebae573ab815661f7129baef099e
Reviewed-on: https://chromium-review.googlesource.com/983652
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Chung-yih Wang <cywang@chromium.org>
10 files changed