Separated OpenstackInterface feature from OpenstackNetworking application.

Change-Id: I4766de7e93c5b432c50a2167b9a9d9d4605b1ad2
diff --git a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/OpenstackSwitchingService.java b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/OpenstackSwitchingService.java
index 9f70a00..a826f98 100644
--- a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/OpenstackSwitchingService.java
+++ b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/OpenstackSwitchingService.java
@@ -15,6 +15,10 @@
  */
 package org.onosproject.openstacknetworking;
 
+import org.onosproject.openstackinterface.OpenstackNetwork;
+import org.onosproject.openstackinterface.OpenstackPort;
+import org.onosproject.openstackinterface.OpenstackSubnet;
+
 import java.util.Map;
 
 /**