Remove Python dependency from TensorPipe RPC agent (#42678)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42678
ghstack-source-id: 109544679
Test Plan: CI
Reviewed By: mrshenli
Differential Revision: D22978716
fbshipit-source-id: 31f91d35e9538375b047184cf4a735e4b8809a15
