use synchronizers.openstack.openstacksyncstep instead of synchronizers.base.openstacksyncstep

Change-Id: I0e315695cb0b38ce56368721a0b4ea131ae339d4
diff --git a/xos/synchronizer/steps/sync_controller_networks.py b/xos/synchronizer/steps/sync_controller_networks.py
index bdb6eab..dd7d722 100644
--- a/xos/synchronizer/steps/sync_controller_networks.py
+++ b/xos/synchronizer/steps/sync_controller_networks.py
@@ -6,7 +6,7 @@
 from netaddr import IPAddress, IPNetwork
 from django.db.models import F, Q
 from xos.config import Config
-from synchronizers.base.openstacksyncstep import OpenStackSyncStep
+from synchronizers.openstack.openstacksyncstep import OpenStackSyncStep
 from synchronizers.base.syncstep import *
 from core.models.network import *
 from core.models.slice import *