schema-version added in VNFD, NSD, VLR, VNFR and NSR

Change-Id: I718533b5fd5dac26d07f2093f42485e56de6adc9
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/models/yang/vlr.yang b/models/yang/vlr.yang
index 6a9b591..9137539 100644
--- a/models/yang/vlr.yang
+++ b/models/yang/vlr.yang
@@ -50,6 +50,12 @@
 
   augment "/rw-project:project" {
     container vlr-catalog {
+      leaf schema-version {
+        description "Schema version for the VLR. If unspecified, it assumes v3.0";
+        type string;
+        default "v3.0";
+      }
+
       config false;
 
       list vlr {