CORD-2340 volt service unit tests

Change-Id: I78b35b0e577ac2200e68eab9d550563239e7e648
(cherry picked from commit 48aeaed51c1b26ebdae1d9e3584001891e75a7d7)
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