Update CTS upload scripts to support v2 pipeline.

For unibuild model, model.board and for non unibuild ones board.board
BUG=b:130679085
 TEST=./upload_cts.py <build_id> <results_dir_path>

Change-Id: Icfae143278a5a987d9c8422664e35976cb4db4ec
Reviewed-on: https://chromium-review.googlesource.com/1573198
Commit-Ready: Rohit Makasana <rohitbm@chromium.org>
Tested-by: Nita Nair <nnita@chromium.org>
Tested-by: Rohit Makasana <rohitbm@chromium.org>
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
3 files changed