Updating tutorial cell to not secure SSH

Change-Id: I2334394871a82c5353ff17da42597684b2c28a64
diff --git a/tools/test/cells/tutorial b/tools/test/cells/tutorial
index 508008d..28186f4 100644
--- a/tools/test/cells/tutorial
+++ b/tools/test/cells/tutorial
@@ -6,5 +6,5 @@
 export OC3="10.0.3.103"
 export OCN="10.0.3.1"
 
-export ONOS_USE_SSH=true
+unset ONOS_USE_SSH
 export ONOS_APPS=drivers,openflow,proxyarp