CORD-1010 update ca certificates for openstack sync, remove sysctl tag support

Change-Id: Idd696966d9bc39c1f9984b0f6ac3a3a85371e952
diff --git a/xos/synchronizer/steps/sync_controller_networks.py b/xos/synchronizer/steps/sync_controller_networks.py
index 8187e84..329bb57 100644
--- a/xos/synchronizer/steps/sync_controller_networks.py
+++ b/xos/synchronizer/steps/sync_controller_networks.py
@@ -102,7 +102,7 @@
         controller_network.subnet_id = subnet_id
 	controller_network.backend_status = '1 - OK'
         if not controller_network.segmentation_id:
-            controller_network.segmentation_id = self.get_segmentation_id(controller_network)
+            controller_network.segmentation_id = str(self.get_segmentation_id(controller_network))
         controller_network.save()