CORD-2238 unit tests for veg syncsteps

Change-Id: I05e3360f61fdd6248a8538e88a2f68693e858230
(cherry picked from commit 60671dcbf9f44605bf7378373a9bbf844a60a5c5)
diff --git a/xos/unittest.cfg b/xos/unittest.cfg
index a5bdb18..71be7ca 100644
--- a/xos/unittest.cfg
+++ b/xos/unittest.cfg
@@ -2,3 +2,4 @@
 plugins=nose2-plugins.exclude
 code-directories=synchronizer
                  model_policies
+                 steps