Enable test_stress_light_rpc in rpc_test.py

Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/29473

Test Plan: Imported from OSS

Differential Revision: D18404820

Pulled By: mrshenli

fbshipit-source-id: de0f18db208d83794507c162483bb948056af533
diff --git a/test/rpc_test.py b/test/rpc_test.py
index 0b18145..d5bdaf4 100644
--- a/test/rpc_test.py
+++ b/test/rpc_test.py
@@ -688,7 +688,6 @@
             )
         )
 
-    @unittest.skip("Test is flaky, see https://github.com/pytorch/pytorch/issues/29150")
     @dist_init
     def test_stress_light_rpc(self):
         self._stress_test_rpc(light_rpc)