bigquery.it.ITBigQueryTest: testInsertAll failed

[flaky-bot]

This test failed!

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---

commit: 3e376b1
buildURL: Build Status, Sponge
status: failed

Test output

com.google.cloud.bigquery.BigQueryException: The service is currently unavailable.
	at com.google.cloud.bigquery.it.ITBigQueryTest.testInsertAll(ITBigQueryTest.java:1968)
Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 
503 Service Unavailable
POST https://www.googleapis.com/bigquery/v2/projects/gcloud-devel/datasets/gcloud_test_dataset_temp_86fcd683_907b_46b0_9199_f89b48086683/tables/test_insert_all_table/insertAll?prettyPrint=false
{
  "code": 503,
  "errors": [
    {
      "domain": "global",
      "message": "The service is currently unavailable.",
      "reason": "backendError"
    }
  ],
  "message": "The service is currently unavailable.",
  "status": "UNAVAILABLE"
}
	at com.google.cloud.bigquery.it.ITBigQueryTest.testInsertAll(ITBigQueryTest.java:1968)

[flaky-bot]

Closing as a duplicate of #2642