Changed to use XOS client to get service and port information

XOS client still gets these information from OpenStack temporarily
until XOS provides these APIs

Change-Id: I1ef9302f719a18a7377221f63b84431c2cdface8
diff --git a/apps/xosclient/src/main/java/org/onosproject/xosclient/api/VtnPortApi.java b/apps/xosclient/src/main/java/org/onosproject/xosclient/api/VtnPortApi.java
index 593f32e..e4e56d3 100644
--- a/apps/xosclient/src/main/java/org/onosproject/xosclient/api/VtnPortApi.java
+++ b/apps/xosclient/src/main/java/org/onosproject/xosclient/api/VtnPortApi.java
@@ -44,4 +44,22 @@
      * @return vtn port; null if it fails to get port information
      */
     VtnPort vtnPort(VtnPortId portId);
+
+    /**
+     * Returns port information from OpenStack with port id.
+     *
+     * @param portId port id
+     * @return vtn port; null if it fails to get port information
+     */
+    // TODO remove this when XOS provides port information
+    VtnPort vtnPort(VtnPortId portId, OpenStackAccess osAccess);
+
+    /**
+     * Returns port information from OpenStack with port name.
+     *
+     * @param portName port name
+     * @return vtn port; null if it fails to get port information
+     */
+    // TODO remove this when XOS provides port information
+    VtnPort vtnPort(String portName, OpenStackAccess osAccess);
 }