Convert cdef values into module level attributes
Convert cdef values into module level attributes

Summary: As in title, replace cdef values with module level attributes

Reviewed By: pranavtbhat

Differential Revision: D32788433

fbshipit-source-id: 7df97fd17a6aef9cd2d637f12c0bef8993fd253f

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly