Provide deploy_app.py script to deploy the app.

The script will 1) deploy the endpoints service; 2) fill the app.yaml
with the latest endpoints service config id; 3) deploy the app to GAE.

BUG=chromium:746514
TEST=manually deployed & tested

Change-Id: I1ef570b2111eb244011b7d14914caccda9fd485a
2 files changed