Remove py_generator from thrift/lib/cpp2/fatal/demo:data
Remove py_generator from thrift/lib/cpp2/fatal/demo:data

Summary:
py_generator is going away soon

also fixed set initialization bug in the test IDL

Reviewed By: yfeldblum

Differential Revision: D7149117

fbshipit-source-id: 3dc610b224c269547eae74ef6418b3db4d38346f

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift