CORD-1993 port vsg model policy test to new framework

Change-Id: I23a408a5cf5c442f62fced5d5638f7757c17ae43
(cherry picked from commit 710b8657f8bf11c102bce84dc1103bba72d235a4)
diff --git a/xos/unittest.cfg b/xos/unittest.cfg
new file mode 100644
index 0000000..a5bdb18
--- /dev/null
+++ b/xos/unittest.cfg
@@ -0,0 +1,4 @@
+[unittest]
+plugins=nose2-plugins.exclude
+code-directories=synchronizer
+                 model_policies