Added support for dual-homed hosts (on "classic" topo).

Change-Id: I47f4b3bf5756928452cbf99c4be2e3e1d6c8fa92
diff --git a/tools/test/topos/dual-onos.py b/tools/test/topos/dual-onos.py
new file mode 100644
index 0000000..b0b92ed
--- /dev/null
+++ b/tools/test/topos/dual-onos.py
@@ -0,0 +1,6 @@
+#!/usr/bin/python
+
+from onosnet import run
+from dual import DualTopo
+
+run( DualTopo() )