MAGETWO-51104: Special price is not displayed at the catalog/product page for the configurable products

- fix integration tests

Author: Valeriy Nayda

app/code/Magento/ConfigurableProduct/Model/Product/Type/Configurable.php

@@ -517,7 +517,6 @@ public function getUsedProducts($product, $requiredAttributeIds = null)
                 ->addAttributeToSelect('weight')
                 ->addAttributeToSelect('image')
                 ->addAttributeToSelect('status')
-                ->addPriceData()
                 ->addAttributeToSelect($this->getCatalogConfig()->getProductAttributes())
                 ->addFilterByRequiredOptions()
                 ->setStoreId($product->getStoreId());

app/code/Magento/ConfigurableProduct/Test/Unit/Model/Product/Type/ConfigurableTest.php

@@ -355,7 +355,6 @@ public function testGetUsedProducts()
                 'addAttributeToSelect',
                 'addFilterByRequiredOptions',
                 'setStoreId',
-                'addPriceData',
             ]
         )->disableOriginalConstructor()
             ->getMock();
@@ -364,7 +363,6 @@ public function testGetUsedProducts()
         $productCollection->expects($this->any())->method('setFlag')->will($this->returnSelf());
         $productCollection->expects($this->any())->method('addFilterByRequiredOptions')->will($this->returnSelf());
         $productCollection->expects($this->any())->method('setStoreId')->with(5)->will($this->returnValue([]));
-        $productCollection->expects($this->any())->method('addPriceData')->will($this->returnSelf());
         $this->_productCollectionFactory->expects($this->any())->method('create')
             ->will($this->returnValue($productCollection));
         $this->_model->getUsedProducts($product);