Add private_class_method definition to several cluster modules

Author: supercaracal

lib/redis/cluster/command_loader.rb

@@ -27,6 +27,8 @@ def fetch_command_details(node)
       rescue CannotConnectError, ConnectionError, CommandError
         {} # can retry on another node
       end
+
+      private_class_method :fetch_command_details
     end
   end
 end

lib/redis/cluster/node_loader.rb

@@ -30,6 +30,8 @@ def fetch_node_info(node)
       rescue CannotConnectError, ConnectionError, CommandError
         {} # can retry on another node
       end
+
+      private_class_method :fetch_node_info
     end
   end
 end

lib/redis/cluster/slot_loader.rb

@@ -42,6 +42,8 @@ def stringify_node_key(arr, default_ip)
         ip = default_ip if ip.empty? # When cluster is down
         NodeKey.build_from_host_port(ip, port)
       end
+
+      private_class_method :fetch_slot_info, :parse_slot_info, :stringify_node_key
     end
   end
 end