Log the Redis shard addresses as originally received from the head GCS. (#12011)

src/ray/gcs/redis_client.cc

@@ -86,6 +86,8 @@ static void GetRedisShards(redisContext *context, std::vector<std::string> *addr
     int port;
     ss >> port;
     ports->emplace_back(port);
+    RAY_LOG(DEBUG) << "Received Redis shard address " << addr << ":" << port
+                   << " from head GCS.";
   }
   freeReplyObject(reply);
 }