Support VM resize and cold migration in openstack networking app

Change-Id: I46ecae7a1eb2bfe9a4093be6893e65db485b7f58
diff --git a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/DistributedInstancePortStore.java b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/DistributedInstancePortStore.java
index b313cce..e9d2b2f 100644
--- a/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/DistributedInstancePortStore.java
+++ b/apps/openstacknetworking/app/src/main/java/org/onosproject/openstacknetworking/impl/DistributedInstancePortStore.java
@@ -190,7 +190,7 @@
             InstancePort.State oldState = event.oldValue().value().state();
             InstancePort.State newState = event.newValue().value().state();
 
-            if (oldState == ACTIVE && newState == MIGRATING) {
+            if ((oldState == ACTIVE || oldState == INACTIVE) && newState == MIGRATING) {
                 notifyDelegate(new InstancePortEvent(
                         OPENSTACK_INSTANCE_MIGRATION_STARTED,
                         event.newValue().value()));
@@ -227,8 +227,6 @@
             notifyDelegate(new InstancePortEvent(
                     OPENSTACK_INSTANCE_PORT_UPDATED,
                     event.newValue().value()));
-
-            // TODO: need to handle cold migration
         }
     }
 }