Add timeout_ns_update to the NS update params in valdation.py

Change-Id: I1def985bd805ecf9320ea548c5f51b2a679ba859
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/osm_nbi/validation.py b/osm_nbi/validation.py
index 112461b..5c75522 100644
--- a/osm_nbi/validation.py
+++ b/osm_nbi/validation.py
@@ -447,6 +447,7 @@
     "properties": {
         "lcmOperationType": string_schema,
         "nsInstanceId": id_schema,
+        "timeout_ns_update": integer1_schema,
         "updateType": {
             "enum": ["CHANGE_VNFPKG", "REMOVE_VNF", "MODIFY_VNF_INFORMATION"]
         },