Add new dynamic scaling test

Updating params files to include missing test case

Change-Id: I795ba55eebe58a147f9d531790b604bf6621f1fa
diff --git a/TestON/tests/HA/HAstopNodes/HAstopNodes.params b/TestON/tests/HA/HAstopNodes/HAstopNodes.params
index d2eb635..dd035f5 100644
--- a/TestON/tests/HA/HAstopNodes/HAstopNodes.params
+++ b/TestON/tests/HA/HAstopNodes/HAstopNodes.params
@@ -19,7 +19,7 @@
     #CASE15: Check that Leadership Election is still functional
     #CASE16: Install Distributed Primitives app
     #CASE17: Check for basic functionality with distributed primitives
-    <testcases>1,2,8,3,4,5,14,16,17,[61,8,7,4,15,17,62],8,7,4,15,17,9,8,4,10,8,4,11,8,4,12,8,4,13</testcases>
+    <testcases>1,2,8,21,3,4,5,14,16,17,[61,8,7,4,15,17,62],8,7,4,15,17,9,8,4,10,8,4,11,8,4,12,8,4,13</testcases>
 
     <apps></apps>
     <ONOS_Configuration>