add missing import, fixes #40

Signed-off-by: S.Çağlar Onur <caglar@10ur.org>
diff --git a/planetstack/openstack_observer/steps/sync_controller_networks.py b/planetstack/openstack_observer/steps/sync_controller_networks.py
index 242073d..bdf53a0 100644
--- a/planetstack/openstack_observer/steps/sync_controller_networks.py
+++ b/planetstack/openstack_observer/steps/sync_controller_networks.py
@@ -10,6 +10,7 @@
 from core.models.sliver import Sliver
 from util.logger import Logger, logging
 from observer.ansible import *
+from openstack.driver import OpenStackDriver
 
 import pdb