CORD-1092: Example service ported over to xproto

Change-Id: I3edd49d1c1e87c800b5bc8cb2316cb8bc19f4bc2
diff --git a/xos/exampleservice-onboard.yaml b/xos/exampleservice-onboard.yaml
index 777174b..4bdb44d 100644
--- a/xos/exampleservice-onboard.yaml
+++ b/xos/exampleservice-onboard.yaml
@@ -13,7 +13,7 @@
           base_url: file:///opt/xos_services/exampleservice/xos/
           # The following will concatenate with base_url automatically, if
           # base_url is non-null.
-          models: models.py
+          xproto: ./
           admin: admin.py
           synchronizer: synchronizer/manifest
           synchronizer_run: exampleservice-synchronizer.py