pytorch

a9f3f48f - Revert D5578006: Add local shutdown to process group agent

Revert D5578006: Add local shutdown to process group agent Test Plan: revert-hammer Differential Revision: D5578006 Original commit changeset: 6258879fb44c fbshipit-source-id: 11b893b3a280a8383eeb20a0548626811616dca1