Change example for preferences
Change example for preferences

Change-Id: I9425ea7da6d5da0b5640dbb76c890785b35badd3

mtougeron/python-openstacksdk,briancurtin/python-openstacksdk,dudymas/python-openstacksdk,dtroyer/python-openstacksdk,dudymas/python-openstacksdk,mtougeron/python-openstacksdk,dtroyer/python-openstacksdk,openstack/python-openstacksdk,openstack/python-openstacksdk,briancurtin/python-openstacksdk,stackforge/python-openstacksdk,stackforge/python-openstacksdk