[batch] Retry docker pulls when 503 is reported as a 500 (#11727)
[batch] Retry docker pulls when 503 is reported as a 500 (#11727)

* [batch] Retry docker pulls when 503 is reported as a 500

* fix
hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail