ENGCOM-2156: [Backport] Declare module namespace before template path name(Magento_Sales::order/info.phtml). #16475

 - Merge Pull Request #16475 from gelanivishal/magento2:2.1-develop-PR-port-16206
 - Merged commits:
   1. 18f255b

Author: magento-engcom-team

app/code/Magento/Sales/Block/Order/Info.php

@@ -21,7 +21,7 @@ class Info extends \Magento\Framework\View\Element\Template
     /**
      * @var string
      */
-    protected $_template = 'order/info.phtml';
+    protected $_template = 'Magento_Sales::order/info.phtml';
 
     /**
      * Core registry