Fix wait for futures append 'result' error
Fix wait for futures append 'result' error

Change-Id: I3bdd91148abfec5b74a3aa8b6cac656dc7c645ab
Signed-off-by: Yuanbin.Chen <115798e15ddd872778e240322a1a46f7d51b5ce2@gmail.com>

stackforge/python-openstacksdk,dtroyer/python-openstacksdk,openstack/python-openstacksdk,stackforge/python-openstacksdk,openstack/python-openstacksdk,dtroyer/python-openstacksdk