Add reasonable default to tf-serving s3 creds (#1304)
Add reasonable default to tf-serving s3 creds (#1304)

Most of people will use env name as key in secret, might as well make it
default
kubeflow/kubeflow,kubeflow/kubeflow,kubeflow/kubeflow,kubeflow/kubeflow,kubeflow/kubeflow,kubeflow/kubeflow