MAGETWO-64606: Update performance scenario according to the latest performance fragments change

- Added copyright text

Author: epamVitaliKirychenka

setup/performance-toolkit/benchmark.jmx

@@ -1,4 +1,10 @@
 <?xml version="1.0"?>
+<!--
+/**
+ * Copyright © 2013-2017 Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
 <jmeterTestPlan version="1.2" properties="2.8" jmeter="2.13 r1665067">
   <hashTree>
     <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Performance Toolkit" enabled="true">