CORD-866 fix error when printing traceback in orm_listall test

Change-Id: I0959c95126f05074f938c3e7f2efdfd49cc9e47e
diff --git a/xos/xos_client/tests/orm_listall.py b/xos/xos_client/tests/orm_listall.py
index d76be05..4da92d1 100644
--- a/xos/xos_client/tests/orm_listall.py
+++ b/xos/xos_client/tests/orm_listall.py
@@ -1,4 +1,5 @@
 import sys
+import traceback
 sys.path.append("..")
 
 from xosapi import xos_grpc_client