TFCONFIG needs to set environment:cloud to support older versions. #766
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Older versions of TF (something like TF <=1.6) depend on the field
environment in the TF_CONFIG to determine whether job is running distributed
or not. We need to set it to environment: cloud so that it TF.estimator API
will work correctly.
Later versions of TF; e.g. TF 1.8 don't use the environment field. So
the existence of the environment field should be a null op.
Related to: #761
This change is