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Fix benchmark imports and add license stmt

Cifar keras refactor

- kears_cifar_main returns dict of stats after run.
- unit tests added for keras_common.
- lint issues fixed in all 4 files.

 - Average of 5 runs single gpu is 93%+ range 92.5 to 93.4 top_1

For tf2 this will only be available in `compat.v1`.

1. `tf.contrib.data.batch_and_drop_remainder()` has been deprecated for a while now.
2. `Dataset.make_one_shot_iterator()` is no longer necessary in input functions, and avoiding it lead to better performance on TPUs. (It will also be removed in TF 2.0.)

input_url doesn't get correct url string in Windows. The os.path.join() function add "\\" to the path, and it resulted invalid URL for the data file.

* Add CIFAR-10 support for keras application models.