Clean up ruby command service

plugins/commands/serve/service/command_service.rb

@@ -88,19 +88,6 @@ module VagrantPlugins
           return subcommands
         end
 
-        def subcommand_spec(*args)
-          return SDK::FuncSpec.new
-        end
-
-        def subcommands(req, ctx)
-          ServiceInfo.with_info(ctx) do |info|
-            
-          end
-          SDK::Command::SubcommandResp.new(
-            commands: ["test", "thing"],
-          )
-        end
-
         def augment_cmd_class(cmd_cls)
           # Create a new anonymous class based on the command class
           # so we can modify the setup behavior