Improving net test tools and scenarios.

Change-Id: I2b53fa7b28e1135d2356ae58d4ee8ac35184d9b8
diff --git a/tools/test/topos/topo b/tools/test/topos/topo
new file mode 100755
index 0000000..854de50
--- /dev/null
+++ b/tools/test/topos/topo
@@ -0,0 +1,10 @@
+#!/bin/bash
+# -----------------------------------------------------------------------------
+# Starts the specified mininet topology.
+# -----------------------------------------------------------------------------
+cd $(dirname $0)
+
+topo=${1:-att-onos.py}
+
+[ -n "$1" ] && shift
+sudo python $topo "$@"