Adding type and value fields to Python type stub for Union
Adding type and value fields to Python type stub for Union

Summary: Adding two fields to the Union stub to allow full use of Thrift properties.

Reviewed By: ylectric

Differential Revision: D22475797

fbshipit-source-id: 6b3a6af37c32de4bef074f28c0ba4c33eaa7c250

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