[ONOS-7684] Support VM Live Migration (VxLAN + VLAN)

Change-Id: I4717f0af6731b41eaf3114994f2087af74c3e3f5
diff --git a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortEvent.java b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortEvent.java
index 00f15ed..4276cf2 100644
--- a/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortEvent.java
+++ b/apps/openstacknetworking/api/src/main/java/org/onosproject/openstacknetworking/api/InstancePortEvent.java
@@ -40,7 +40,17 @@
         /**
          * Signifies that the instance port is disabled.
          */
-        OPENSTACK_INSTANCE_PORT_VANISHED
+        OPENSTACK_INSTANCE_PORT_VANISHED,
+
+        /**
+         * Signifies that the instance migration is started.
+         */
+        OPENSTACK_INSTANCE_MIGRATION_STARTED,
+
+        /**
+         * Signifies that the instance is migration is ended.
+         */
+        OPENSTACK_INSTANCE_MIGRATION_ENDED
     }
 
     /**