fix bug 791. Adding input validation for ns-create. It was only for ns-instantiate

Change-Id: I06f1c79398a8a2209467f90b21b70ab0ff15e9bb
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/osm_nbi/instance_topics.py b/osm_nbi/instance_topics.py
index 100c9b4..eb632ac 100644
--- a/osm_nbi/instance_topics.py
+++ b/osm_nbi/instance_topics.py
@@ -31,6 +31,7 @@
 class NsrTopic(BaseTopic):
     topic = "nsrs"
     topic_msg = "ns"
+    schema_new = ns_instantiate
 
     def __init__(self, db, fs, msg):
         BaseTopic.__init__(self, db, fs, msg)