MAGETWO-90021: [Catalog] ProductAttributeMediaGalleryManagementInterface removes product from index, impossible to restore

- Make Gallery management to get product in editable mode. Fix test.

Author: AlexeyManenok

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

@@ -54,7 +54,7 @@ public function create($sku, ProductAttributeMediaGalleryEntryInterface $entry)
         if (!$this->contentValidator->isValid($entryContent)) {
             throw new InputException(__('The image content is invalid. Verify the content and try again.'));
         }
-        $product = $this->productRepository->get($sku);
+        $product = $this->productRepository->get($sku, true);
 
         $existingMediaGalleryEntries = $product->getMediaGalleryEntries();
         $existingEntryIds = [];
@@ -88,7 +88,7 @@ public function create($sku, ProductAttributeMediaGalleryEntryInterface $entry)
      */
     public function update($sku, ProductAttributeMediaGalleryEntryInterface $entry)
     {
-        $product = $this->productRepository->get($sku);
+        $product = $this->productRepository->get($sku, true);
         $existingMediaGalleryEntries = $product->getMediaGalleryEntries();
         if ($existingMediaGalleryEntries == null) {
             throw new NoSuchEntityException(
@@ -129,7 +129,7 @@ public function update($sku, ProductAttributeMediaGalleryEntryInterface $entry)
      */
     public function remove($sku, $entryId)
     {
-        $product = $this->productRepository->get($sku);
+        $product = $this->productRepository->get($sku, true);
         $existingMediaGalleryEntries = $product->getMediaGalleryEntries();
         if ($existingMediaGalleryEntries == null) {
             throw new NoSuchEntityException(

dev/tests/api-functional/testsuite/Magento/GraphQl/Catalog/ProductViewTest.php

@@ -285,7 +285,6 @@ public function testQueryAllFieldsSimpleProduct()
      */
     public function testQueryMediaGalleryEntryFieldsSimpleProduct()
     {
-        $this->markTestSkipped("Skipped until ticket MAGETWO-90021 is resolved.");
         $productSku = 'simple';
 
         $query = <<<QUERY
@@ -453,7 +452,9 @@ public function testQueryMediaGalleryEntryFieldsSimpleProduct()
             }
             short_description
             sku
-            small_image
+            small_image {
+                path
+            }
             small_image_label
             special_from_date
             special_price