Revert "Enable test_distributed for ROCm but only with nccl backend" (#29736)
Summary:
This reverts commit 7073ee209000a7781c0c863c4ef39bb3bfdb4932.
They are flaky on master:
https://ci.pytorch.org/jenkins/job/pytorch-builds/job/py3.6-clang7-rocmdeb-ubuntu16.04-test2/6830//console
https://ci.pytorch.org/jenkins/job/pytorch-builds/job/py3.6-clang7-rocmdeb-ubuntu16.04-test2/6824//console
https://ci.pytorch.org/jenkins/job/pytorch-builds/job/py3.6-clang7-rocmdeb-ubuntu16.04-test2/6802//console
cc jithunnair-amd
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29736
Differential Revision: D18480543
Pulled By: bddppq
fbshipit-source-id: 9a1dd9aa5f5959dc6fbbfdab0df997514221217a
