[TensorPipe] Add cases for TP in RPC test helpers (#38927)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38927
Since the regexs weren't matching the RPC tests would never confirm that the remote end had correctly shut down and were thus retrying in a loop forever.
ghstack-source-id: 104760686
Test Plan: Ran the RPC test suite after re-enabling some of the TensorPipe tests
Differential Revision: D21703018
fbshipit-source-id: 3e4b8d22810e58c9d72c4317dcf5ba68d6e0b258
