Parameterize CORD app version

Change-Id: I4f9e9f3d383d46bd260a5009121318396b582a8d
diff --git a/vars/cord.yml b/vars/cord.yml
index 1209ab7..0a41fd1 100644
--- a/vars/cord.yml
+++ b/vars/cord.yml
@@ -54,3 +54,5 @@
 management_network_ip: 172.27.0.1/24
 data_plane_ip: 10.168.0.253/24
 
+# CORD ONOS app version
+cord_app_version: 1.2-SNAPSHOT
\ No newline at end of file