Convert unicode to six.string_types for python 3 (#16676)
Convert unicode to six.string_types for python 3 (#16676)

In Python 3, there is no unicode type. This fix converts
unicode to use six.string_types instead, while maintaining
python 2/3 compatibility.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>
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