[Refactor] Rename ClientId to NodeId (#10992)

* rename ClientId to NodeId

* format lint

* format lint

* fix conflicts

* rename new ClientId to NodeId

* update lint

* make same version of clang-format with travis ci

python/ray/__init__.py

@@ -66,7 +66,7 @@ from ray._raylet import (
     ActorCheckpointID,
     ActorClassID,
     ActorID,
-    ClientID,
+    NodeID,
     Config as _Config,
     JobID,
     WorkerID,
@@ -151,7 +151,7 @@ __all__ += [
     "ActorCheckpointID",
     "ActorClassID",
     "ActorID",
-    "ClientID",
+    "NodeID",
     "JobID",
     "WorkerID",
     "FunctionID",