MAGETWO-36591: Merge and build stabilization for Sales & Checkout APIs

 - Clean up unused variable for \Magento\Quote\Api\CartManagementTest::testPlaceOrderForMyCart

Author: marcozheng

dev/tests/api-functional/testsuite/Magento/Quote/Api/CartManagementTest.php

@@ -382,9 +382,6 @@ public function testPlaceOrderForMyCart()
         );
         $token = $customerTokenService->createCustomerAccessToken('customer@example.com', 'password');
 
-        /** @var $quote \Magento\Quote\Model\Quote */
-        $quote = $this->objectManager->create('Magento\Quote\Model\Quote')->load('test_order_1', 'reserved_order_id');
-
         $serviceInfo = [
             'rest' => [
                 'resourcePath' => '/V1/carts/mine/order',