Removing assignment of service-account for launcher #491

Job	Run time
Publish Image (lightgbm-dist-py-test, examples/xgboost/lightgbm-dist/Dockerfile, examples/xgboost... / Publish Image	22s
Publish Image (pytorch-dist-sendrecv-test, examples/pytorch/smoke-dist/Dockerfile) / Publish Image	1m 5s
Publish Image (pytorch-elastic-example-echo, examples/pytorch/elastic/echo/Dockerfile) / Publish Image	8m 24s
Publish Image (pytorch-elastic-example-imagenet, examples/pytorch/elastic/imagenet/Dockerfile) / Publish Image	3m 39s
Publish Image (tf-dist-mnist-test, examples/tensorflow/dist-mnist/Dockerfile) / Publish Image	45s
Publish Image (tf-distributed-worker, examples/tensorflow/distribution_strategy/estimator-API/Doc... / Publish Image	38s
Publish Image (tf-mnist-with-summaries, examples/tensorflow/mnist_with_summaries/Dockerfile) / Publish Image	41s
Publish Image (tf-multi-worker-strategy, examples/tensorflow/distribution_strategy/keras-API/Dock... / Publish Image	3m 45s
Publish Image (tf-smoke, examples/tensorflow/tf_sample/Dockerfile) / Publish Image	47s
Publish Image (xgboost-dist-iris, examples/xgboost/xgboost-dist/Dockerfile, examples/xgboost/xgbo... / Publish Image	2m 0s
Publish Image (xgboost-dist-rabit-test, examples/xgboost/smoke-dist/Dockerfile, examples/xgboost/... / Publish Image	1m 37s
	23m 43s

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