Update backend messages to match new scheme (backend_status and
backend_code instead of backend_status alone)

Change-Id: Idb8b6e1f6b4f993e262491238e98018b4f603399
diff --git a/xos/synchronizer/steps/sync_controller_slices.py b/xos/synchronizer/steps/sync_controller_slices.py
index a4cfd40..663ded8 100644
--- a/xos/synchronizer/steps/sync_controller_slices.py
+++ b/xos/synchronizer/steps/sync_controller_slices.py
@@ -71,7 +71,8 @@
                 raise Exception('Could not update quota for %s'%controller_slice.slice.name)
 
             controller_slice.tenant_id = tenant_id
-            controller_slice.backend_status = '1 - OK'
+            controller_slice.backend_status = 'OK'
+            controller_slice.backend_code = 1
             controller_slice.save()