Fix issues with tf_job_gpu test

[jlewi]

• The setup cluster step should wait for the TfJob operator deployment to
  be ready.

• Ensure that all exceptions result in a failure message being reported to Gubernator.

• Upgrade and fix issues with Kubernetes py client 4.0.0; Fixes SetupCluster failures unexpected keyword argument 'client_configuration' #242

• Bugs with gpu_test Fix GPU test marked as succeeded but airflow step is failing #240

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This change is 

[coveralls]

Coverage increased (+0.1%) to 37.915% when pulling 2f4efd0 on jlewi:gpu_test_fix into e108d55 on tensorflow:master.

[coveralls]

Coverage remained the same at 37.782% when pulling f2644ab on jlewi:gpu_test_fix into e108d55 on tensorflow:master.

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[coveralls]

Coverage remained the same at 37.782% when pulling 657adf4 on jlewi:gpu_test_fix into e108d55 on tensorflow:master.

[jlewi]

/test all

[coveralls]

Coverage remained the same at 37.782% when pulling 1df6e87 on jlewi:gpu_test_fix into e108d55 on tensorflow:master.

[jlewi]

/test all