Implemented dummy Neutron ML2 plugin handler

- Added REST handler for Neutron ML2 ONOS mech driver
- Made cordvtn ARP proxy to handle request for host, too
- Now cordvtn utilizes openstackSwitching only as a Neutron REST client

Change-Id: I6890b6651ddcb9d8cf33fb326e9f0eb721b536a5
diff --git a/apps/cordvtn/src/main/java/org/onosproject/cordvtn/CordVtn.java b/apps/cordvtn/src/main/java/org/onosproject/cordvtn/CordVtn.java
index 2996557..e27aa74 100644
--- a/apps/cordvtn/src/main/java/org/onosproject/cordvtn/CordVtn.java
+++ b/apps/cordvtn/src/main/java/org/onosproject/cordvtn/CordVtn.java
@@ -172,7 +172,7 @@
                                                  mastershipService,
                                                  DEFAULT_TUNNEL);
 
-        arpProxy = new CordVtnArpProxy(appId, packetService);
+        arpProxy = new CordVtnArpProxy(appId, packetService, hostService);
         packetService.addProcessor(packetProcessor, PacketProcessor.director(0));
         arpProxy.requestPacket();