pytorch

8bc821f0 - Revert D21976891: [futures] Add torch.futures.collect_all()/wait_all() python api.

Revert D21976891: [futures] Add torch.futures.collect_all()/wait_all() python api. Test Plan: revert-hammer Differential Revision: D21976891 Original commit changeset: 253c61f503f4 fbshipit-source-id: f839b16f4469e96325b607b6313a1397e1988856