fix the coroutine thing due to entry point pointing at the main method directly
fix the coroutine thing due to entry point pointing at the main method directly

Change-Id: I5f7f0482e7ea63848e5b6d29d34d26986eebc011

GoogleCloudPlatform/ci-for-data-in-bigquery,GoogleCloudPlatform/ci-for-data-in-bigquery