Adding support for link state to GUI.

Change-Id: I6476cf04810f7bc7e88af629a36ce671b42748d0
diff --git a/tools/test/topos/tower b/tools/test/topos/tower
new file mode 100755
index 0000000..8244bae
--- /dev/null
+++ b/tools/test/topos/tower
@@ -0,0 +1,2 @@
+#!/bin/bash
+cd ~/topos && sudo mn --custom tower.py --topo tower --controller remote,${1:-192.168.56.101} --mac