Revert D24093032: Improve logging in ProcessGroupNCCL for debugging purposes.
Test Plan: revert-hammer
Differential Revision:
D24093032 (https://github.com/pytorch/pytorch/commit/c8d76ff7dc21d426c7f2851803071820865a828f)
Original commit changeset: 240b03562f8c
fbshipit-source-id: dab7d54a5ba517bb308a1825b0d63ed146e5269d
