CORD-2238: unit tests for vnaas syncsteps

Change-Id: Ic06b72ddd6d8934dfe0cd56e4d8386eccff19ccf
(cherry picked from commit b3a355468615d9a6eed596a0c698d97856abea98)
diff --git a/xos/unittest.cfg b/xos/unittest.cfg
new file mode 100644
index 0000000..71be7ca
--- /dev/null
+++ b/xos/unittest.cfg
@@ -0,0 +1,5 @@
+[unittest]
+plugins=nose2-plugins.exclude
+code-directories=synchronizer
+                 model_policies
+                 steps