Disable worker_kill & holder_iter_reference combination in test_proper_exit (#20172)
Summary:
cc nairbv
All failures I have seen are of this combination. So let's just disable it for all cases. After #20063 I find it failing for py3 once.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20172
Differential Revision: D15266527
Pulled By: nairbv
fbshipit-source-id: afb9389dfc54a0878d52975ffa37a0fd2aa3a735
