Add a OCN for beast cell file

Change-Id: Ic412e5032341dfd9e41d1065ffd35070265409d3
(cherry picked from commit 916da431aeb57942990470a2bdad316ceecd659b)
diff --git a/tools/test/cells/beast b/tools/test/cells/beast
index 6afd61d..baa97b0 100644
--- a/tools/test/cells/beast
+++ b/tools/test/cells/beast
@@ -15,4 +15,7 @@
 export OC6=10.254.1.206
 export OC7=10.254.1.207
 
+# IP address of Mininet
+export OCN=10.254.1.200
+
 export ONOS_APPS="drivers,null,intentperf"