MAGETWO-3233: Clone - Configurable product doesn't go Out of stock with FPC enabled if customer buy the last associated product

- fixed product deletion flow and unit test

Author: Roman Ganin

app/code/Magento/Catalog/Model/Product.php

@@ -831,7 +831,7 @@ public function eavReindexCallback()
      */
     public function reindex()
     {
-        if ($this->_catalogProduct->isDataForProductCategoryIndexerWasChanged($this)) {
+        if ($this->_catalogProduct->isDataForProductCategoryIndexerWasChanged($this) || $this->isDeleted()) {
             $this->_productFlatIndexerProcessor->reindexRow($this->getEntityId());
             $categoryIndexer = $this->indexerRegistry->get(Indexer\Product\Category::INDEXER_ID);
             if (!$categoryIndexer->isScheduled()) {

dev/tests/unit/testsuite/Magento/Catalog/Model/ProductTest.php

@@ -345,6 +345,7 @@ public function testIsInStock()
 
     public function testIndexerAfterDeleteCommitProduct()
     {
+        $this->model->isDeleted(true);
         $this->categoryIndexerMock->expects($this->once())->method('reindexRow');
         $this->productFlatProcessor->expects($this->once())->method('reindexRow');
         $this->productPriceProcessor->expects($this->once())->method('reindexRow');