ML Engine: Improve logging (#1390)
ML Engine: Improve logging (#1390)

This adds usefull commands on how to interact with the submitted job to the CLI.

Example output:
```shell
INFO:tensorflow:Launched shake_shake_image_mnist_t2t_20190121_123909. See console to track: https://console.cloud.google.com/mlengine/jobs/.
INFO:tensorflow:Interact with the training job from the command line:
INFO:tensorflow:Abort job: gcloud ml-engine jobs cancel shake_shake_image_mnist_t2t_20190121_123909
INFO:tensorflow:Stream logs: gcloud ml-engine jobs stream-logs shake_shake_image_mnist_t2t_20190121_123909
INFO:tensorflow:Open tensorboard: tensorboard --logdir gs://lgeiger-test-bucket/training-test
```
tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor