Implements flow tracer in Openstack Networking UI

Change-Id: I6747de157e63b4d6ffa67274b623b29db311d2e3
diff --git a/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkServiceAdapter.java b/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkServiceAdapter.java
index 07290ad..59f8f5b 100644
--- a/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkServiceAdapter.java
+++ b/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/impl/OpenstackNetworkServiceAdapter.java
@@ -104,6 +104,21 @@
     }
 
     @Override
+    public IpPrefix ipPrefix(String portId) {
+        return null;
+    }
+
+    @Override
+    public String networkType(String netId) {
+        return null;
+    }
+
+    @Override
+    public String gatewayIp(String portId) {
+        return null;
+    }
+
+    @Override
     public void addListener(OpenstackNetworkListener listener) {
 
     }