Cut py cpp2 codegen of terse writes
Cut py cpp2 codegen of terse writes

Summary: [Thrift] Cut py `cpp2` codegen of terse writes.

Reviewed By: stevegury

Differential Revision: D9004101

fbshipit-source-id: 5e99974c8ecc3d7094dd270915c007f9820209d2

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