[gRPC] Migrate raylet client implementation to grpc (#5120)

python/ray/worker.py

@@ -41,7 +41,6 @@ import ray.state
 from ray import (
     ActorHandleID,
     ActorID,
-    ClientID,
     WorkerID,
     JobID,
     ObjectID,
@@ -1923,7 +1922,7 @@ def connect(node,
 
     worker.raylet_client = ray._raylet.RayletClient(
         node.raylet_socket_name,
-        ClientID(worker.worker_id),
+        WorkerID(worker.worker_id),
         (mode == WORKER_MODE),
         worker.current_job_id,
     )