Fixed to read virtual switches from network config

Change-Id: I8740b8484dd7ed16897233eec472f964bab8004f
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 e852cf9..159997e 100644
--- a/apps/cordvtn/src/main/java/org/onosproject/cordvtn/CordVtn.java
+++ b/apps/cordvtn/src/main/java/org/onosproject/cordvtn/CordVtn.java
@@ -176,6 +176,7 @@
                                                  deviceService,
                                                  driverService,
                                                  groupService,
+                                                 configRegistry,
                                                  DEFAULT_TUNNEL);
 
         arpProxy = new CordVtnArpProxy(appId, packetService, hostService);