MAGETWO-31901: Implement Attributes Mapping to Data Interfaces

- Added Configuration for complex attribute classes in Test Service

Author: anupdugar

dev/tests/api-functional/_files/Magento/TestModuleMSC/etc/di.xml

@@ -35,5 +35,12 @@
             <argument name="resource" xsi:type="object">Magento\TestModuleMSC\Model\Resource\Item</argument>
         </arguments>
     </type>
-
+    <type name="Magento\Framework\Api\CustomAttributeMap">
+        <arguments>
+            <argument name="data" xsi:type="array">
+                <item name="customAttributeDataObjectInterface" xsi:type="string">Magento\TestModuleMSC\Api\Data\CustomAttributeDataObjectInterface</item>
+                <item name="customAttributeNestedDataObjectInterface" xsi:type="string">Magento\TestModuleMSC\Api\Data\CustomAttributeNestedDataObjectInterface</item>
+            </argument>
+        </arguments>
+    </type>
 </config>