throw remote exception on client side (#24138)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/24138
catch exception thrown on server, send the exception message back to client and rethrow it.
Reviewed By: mrshenli
Differential Revision: D16748748
fbshipit-source-id: ce18b3ea1b1d28645ec292f58aa0c818d93e559e
