mis-indent in conv_ops_test python scripts

[LeicongLi]

The changed code block was inside the for loop iterating over values from GetTestConfigs().
It make more sense to me to move these line out from the loop, so instead evaluating the unfinished expected_results & computed_values lists for multiple times, only a one time evaluation will be performed on them.

I am not quite sure whats the original purpose how it was writing this way, from my view, I would like to move them out, please correct me if I am wrong.

And a question, could there be a problem to evaluate these tensors over and over again?

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[reedwm]

Good catch! I'm also not sure why it the entire list was originally computed inside the loop. I don't think problems would arise evaluating the tensors over and over again, but its slow and it's better not to.

It would probably be best to not even have a list and assert the two values are all close inside the for-loop but that can always be done later.