MAGETWO-59325: Unable to add custom attribute to product

- Removed unused private method;
- Added suppress warning to unit test;

Author: adifucan

app/code/Magento/Catalog/Controller/Adminhtml/Product/AddAttributeToTemplate.php

@@ -251,18 +251,6 @@ private function getSearchCriteriaBuilder()
         return $this->searchCriteriaBuilder;
     }
 
-    /**
-     * @return SortOrderBuilder
-     */
-    private function getSortOrderBuilder()
-    {
-        if (null === $this->sortOrderBuilder) {
-            $this->sortOrderBuilder = \Magento\Framework\App\ObjectManager::getInstance()
-                ->get(\Magento\Framework\Api\SortOrderBuilder::class);
-        }
-        return $this->sortOrderBuilder;
-    }
-
     /**
      * @return AttributeManagementInterface
      */

app/code/Magento/Catalog/Test/Unit/Controller/Adminhtml/Product/AddAttributeToTemplateTest.php

@@ -22,6 +22,9 @@
 use Magento\Eav\Api\Data\AttributeGroupInterface;
 use Magento\Framework\Controller\Result\Json;
 
+/**
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ */
 class AddAttributeToTemplateTest extends \PHPUnit_Framework_TestCase
 {
     /**