Feature 10910: Migration of Openstack based VM instances

Added feature support for Migration of Openstack based VM instances
from OSM

Change-Id: I7db836401c5b9fee71f032884064593135fb88d9
Signed-off-by: elumalai <deepika.e@tataelxsi.co.in>
diff --git a/osm_nbi/instance_topics.py b/osm_nbi/instance_topics.py
index 74815ca..787f6e1 100644
--- a/osm_nbi/instance_topics.py
+++ b/osm_nbi/instance_topics.py
@@ -28,6 +28,7 @@
     ns_scale,
     ns_update,
     nsi_instantiate,
+    ns_migrate,
 )
 from osm_nbi.base_topic import (
     BaseTopic,
@@ -1158,6 +1159,7 @@
         "update": ns_update,
         "scale": ns_scale,
         "terminate": ns_terminate,
+        "migrate": ns_migrate,
     }
 
     def __init__(self, db, fs, msg, auth):