Adding a basic mininet-based test to STC scenarios.

Change-Id: I193013608e8fcdaede8987536e754da6d1a185bf
diff --git a/tools/test/topos/att-onos b/tools/test/topos/att-onos
new file mode 100755
index 0000000..e473359
--- /dev/null
+++ b/tools/test/topos/att-onos
@@ -0,0 +1,6 @@
+cd $(dirname $0)
+if [ -n "$1" ]; then
+    sudo python att-onos.py "$@"
+else
+    sudo python att-onos.py 10.128.11.1 10.128.11.2 10.128.11.3
+fi