Fixed device subsystem behaviour where auxiliary provider prevented emitting device availability change events.

Change-Id: Iaed6359598ff87d5706e10eb9d905ed0883617d9
diff --git a/tools/test/topos/linear-2.json b/tools/test/topos/linear-2.json
new file mode 100644
index 0000000..c248a23
--- /dev/null
+++ b/tools/test/topos/linear-2.json
@@ -0,0 +1,6 @@
+{
+  "devices": [
+    { "alias":  "s1", "uri": "of:0000000000000001", "annotations": { "driver": "ovs-corsa" } },
+    { "alias":  "s2", "uri": "of:0000000000000002", "annotations": { "driver": "ovs-corsa" } }
+  ]
+}