Added example code based on pystack.
Added example code based on pystack.

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