migrate code over from xos repo

Change-Id: I764ac3196babdb1ce78dded2b2d8d6ad6e965ca6
diff --git a/xos/synchronizer/model_policies/model_policy_ControllerSlice.py b/xos/synchronizer/model_policies/model_policy_ControllerSlice.py
new file mode 100644
index 0000000..bfe7995
--- /dev/null
+++ b/xos/synchronizer/model_policies/model_policy_ControllerSlice.py
@@ -0,0 +1,25 @@
+def handle(controller_slice):
+    from core.models import ControllerSlice, Slice
+   
+    try:
+        my_status_code = int(controller_slice.backend_status[0])
+        try:
+            his_status_code = int(controller_slice.slice.backend_status[0])
+        except:
+            his_status_code = 0
+ 
+        fields = []
+        if (my_status_code not in [0,his_status_code]):
+            controller_slice.slice.backend_status = controller_slice.backend_status
+            fields+=['backend_status']
+
+        if (controller_slice.backend_register != controller_slice.slice.backend_register):
+            controller_slice.slice.backend_register = controller_slice.backend_register
+            fields+=['backend_register']
+
+        controller_slice.slice.save(update_fields = fields)
+
+        
+    except Exception,e:
+        print str(e)	
+        pass