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IBM Watson samples: from six.moves import xrange (#1877)

Discovered in #1721

__xrange()__ was removed in Python 3 in favor of an improved version of __range()__.  This PR ensures equivalent functionality in both Python 2 and Python 3.

```
./samples/contrib/ibm-samples/watson/source/model-source-code/tf-model/input_data.py:100:40: F821 undefined name 'xrange'
            fake_image = [1.0 for _ in xrange(784)]
                                       ^
./samples/contrib/ibm-samples/watson/source/model-source-code/tf-model/input_data.py:102:41: F821 undefined name 'xrange'
            return [fake_image for _ in xrange(batch_size)], [
                                        ^
./samples/contrib/ibm-samples/watson/source/model-source-code/tf-model/input_data.py:103:37: F821 undefined name 'xrange'
                fake_label for _ in xrange(batch_size)]
                                    ^
```

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