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

Change-Id: I0e315695cb0b38ce56368721a0b4ea131ae339d4
diff --git a/xos/synchronizer/steps/sync_images.py b/xos/synchronizer/steps/sync_images.py
index 1638fd0..d4ef430 100644
--- a/xos/synchronizer/steps/sync_images.py
+++ b/xos/synchronizer/steps/sync_images.py
@@ -2,7 +2,7 @@
 import base64
 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 core.models.image import Image
 from xos.logger import observer_logger as logger