[commom]correct the output of "openstack image" command
[commom]correct the output of "openstack image" command

this patch:
- correct the output of "openstack image" command to improve the accuracy

Change-Id: If9509c8e2767dde2c30642fe109fe832995e0025

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals