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

folly/python/fiber_manager.pyx

@@ -31,12 +31,12 @@ from weakref import WeakKeyDictionary
 
 
 #asynico Loops to FiberManager
-cdef object loop_to_controller = WeakKeyDictionary()
+loop_to_controller = WeakKeyDictionary()
 
 # weak reference to the last seen event loop
-cdef object last_loop = None
+last_loop = None
 # FiberManager for the last seen event loop
-cdef object last_manager = None
+last_manager = None
 
 # cleanup callback that would clean last_manager
 # if object referenced by last_loop is collected