remove reference to openstacksyncstep

Change-Id: Icba2fc70ce884a8c799bc09342b7a736ca83d7b5
diff --git a/xos/synchronizer/steps/sync_vroutertenant.py b/xos/synchronizer/steps/sync_vroutertenant.py
index 06f5e4a..a67d210 100644
--- a/xos/synchronizer/steps/sync_vroutertenant.py
+++ b/xos/synchronizer/steps/sync_vroutertenant.py
@@ -3,7 +3,6 @@
 from collections import defaultdict
 from django.db.models import F, Q
 from xos.config import Config
-from synchronizers.base.openstacksyncstep import OpenStackSyncStep
 from synchronizers.base.syncstep import *
 from core.models import Controller
 from core.models import Image, ControllerImages