adding 'vlan_tag' values in autogenerated tests

Change-Id: I9d89d101892e7ceb9822d7ce87eca906793112b0
diff --git a/src/test/cord-api/Framework/utils/utils.py b/src/test/cord-api/Framework/utils/utils.py
index 773fa2c..153ef72 100644
--- a/src/test/cord-api/Framework/utils/utils.py
+++ b/src/test/cord-api/Framework/utils/utils.py
@@ -294,6 +294,8 @@
             return random.choice(['in', 'out'])
         if value == 'flavor':
             return random.choice(['m1.large', 'm1.medium', 'm1.small'])
+        if value == 'vlan_tag':
+            return random.choice(['555', '1-4096', 'ANY'])
         else:
             return None