MAGETWO-32783: Implement Gift message related interfaces

Author: irenelagno

app/code/Magento/GiftMessage/etc/webapi.xml

@@ -19,13 +19,13 @@
             <resource ref="Magento_Sales::create" />
         </resources>
     </route>
-    <route url="/V1/carts/:cartId/gift-message" method="PUT">
+    <route url="/V1/carts/:cartId/gift-message" method="POST">
         <service class="Magento\GiftMessage\Api\CartRepositoryInterface" method="save"/>
         <resources>
             <resource ref="Magento_Sales::create" />
         </resources>
     </route>
-    <route url="/V1/carts/:cartId/gift-message/:itemId" method="PUT">
+    <route url="/V1/carts/:cartId/gift-message/:itemId" method="POST">
         <service class="Magento\GiftMessage\Api\ItemRepositoryInterface" method="save"/>
         <resources>
             <resource ref="Magento_Sales::create" />

dev/tests/api-functional/testsuite/Magento/GiftMessage/Api/CartRepositoryTest.php

@@ -77,7 +77,7 @@ public function testSave()
         $serviceInfo = [
             'rest' => [
                 'resourcePath' => self::RESOURCE_PATH . $cartId . '/gift-message',
-                'httpMethod' => RestConfig::HTTP_METHOD_PUT,
+                'httpMethod' => RestConfig::HTTP_METHOD_POST,
             ],
             'soap' => [
                 'service' => self::SERVICE_NAME,

dev/tests/api-functional/testsuite/Magento/GiftMessage/Api/ItemRepositoryTest.php

@@ -82,7 +82,7 @@ public function testSave()
         $serviceInfo = [
             'rest' => [
                 'resourcePath' => self::RESOURCE_PATH . $cartId . '/gift-message/' .  $itemId,
-                'httpMethod' => RestConfig::HTTP_METHOD_PUT,
+                'httpMethod' => RestConfig::HTTP_METHOD_POST,
             ],
             'soap' => [
                 'service' => self::SERVICE_NAME,

dev/tests/static/testsuite/Magento/Test/Php/_files/whitelist/common.txt

@@ -63,7 +63,6 @@ app/code/Magento/Directory/Model/Resource/Region
 app/code/Magento/Eav/Model/Cache/Type.php
 app/code/Magento/GiftMessage/Model/Plugin
 app/code/Magento/GiftMessage/Model/Type/Plugin
-app/code/Magento/GiftMessage/Service
 app/code/Magento/GoogleShopping/Block/SiteVerification.php
 app/code/Magento/GoogleShopping/Model/AttributeFactory.php
 app/code/Magento/GroupedImportExport