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ARROW-901: [Python] Add Parquet unit test for fixed size binary

This verifies that all is working properly after PARQUET-965.

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #665 from wesm/ARROW-901 and squashes the following commits:

6433c14 [Wes McKinney] Add Parquet unit test for fixed size binary