Enable test_py_rref_args_user_share in rpc_test.py
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/29472
Test Plan: Imported from OSS
Differential Revision: D18404818
Pulled By: mrshenli
fbshipit-source-id: 1fcd19b178dc20540a210601cbb2c974be14a7cc
