[AIRFLOW-2769] Increase num_retries polling value on Dataflow hook
[AIRFLOW-2769] Increase num_retries polling value on Dataflow hook

Closes #3617 from pwoods25443/2769-dataflow-num-
retries

lxneng/incubator-airflow,lxneng/incubator-airflow,lxneng/incubator-airflow,lxneng/incubator-airflow