Minor fix to openstack image show command
Minor fix to openstack image show command

image show using V2 api was failing.

openstack --os-image-api-version 2 image show <image_id>
ERROR: openstack _info

Closes-Bug: #1450829
Change-Id: Ic95db2f63d9f5f37e29f0d7e048397da311fbf8c

BjoernT/python-openstackclient,openstack/python-openstackclient,redhat-openstack/python-openstackclient,dtroyer/python-openstackclient,redhat-openstack/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient,BjoernT/python-openstackclient