CORD-1092: Example service ported over to xproto

Change-Id: I3edd49d1c1e87c800b5bc8cb2316cb8bc19f4bc2
diff --git a/xos/attic/exampletenant_bottom.py b/xos/attic/exampletenant_bottom.py
new file mode 100644
index 0000000..7ac737e
--- /dev/null
+++ b/xos/attic/exampletenant_bottom.py
@@ -0,0 +1,8 @@
+def model_policy_exampletenant(pk):
+    with transaction.atomic():
+        tenant = ExampleTenant.objects.select_for_update().filter(pk=pk)
+        if not tenant:
+            return
+        tenant = tenant[0]
+        tenant.manage_container()
+