MAGETWO-56206: API - inconsistency in the Magento response data types

- Remove the optional extension_attributes parameter from functional api tests

Author: tjwiebell

dev/tests/api-functional/testsuite/Magento/Catalog/Api/ProductRepositoryInterfaceTest.php

@@ -344,8 +344,7 @@ public function testProductLinks()
             "link_type" => "related",
             "linked_product_sku" => "product_simple_500",
             "linked_product_type" => "simple",
-            "position" => 0,
-            "extension_attributes" => []
+            "position" => 0
         ];
         $productWithRelatedData = [
             ProductInterface::SKU => "product_simple_with_related_500",
@@ -373,8 +372,7 @@ public function testProductLinks()
             "link_type" => "upsell",
             "linked_product_sku" => "product_simple_500",
             "linked_product_type" => "simple",
-            "position" => 0,
-            "extension_attributes" => []
+            "position" => 0
         ];
         $productWithUpsellData = [
             ProductInterface::SKU => "product_simple_with_related_500",

dev/tests/api-functional/testsuite/Magento/ConfigurableProduct/Api/ConfigurableProductManagementTest.php

@@ -69,8 +69,7 @@ public function testGetVariation()
                         'value' => $attributeOptionValue
                     ]
                 ],
-                'tier_prices' => [],
-                'extension_attributes' => []
+                'tier_prices' => []
             ]
         ];
         ksort($expectedItems);

dev/tests/api-functional/testsuite/Magento/GroupedProduct/Api/ProductRepositoryInterfaceTest.php

@@ -162,7 +162,7 @@ public function testProductLinks()
                             "position" => 0, "extension_attributes" => ["qty" => 4]];
         $productLinkData2 = ["sku" => "group_product_500", "link_type" => "upsell",
                              "linked_product_sku" => "product_simple_500", "linked_product_type" => "simple",
-                             "position" => 0, "extension_attributes" => []];
+                             "position" => 0];
         $productWithGroupData =  [
             ProductInterface::SKU => "group_product_500",
             ProductInterface::NAME => "Group Product 500",