Doc: Replace nova image-list
Doc: Replace nova image-list

The "nova image-list" command has been deprecated, this patch is replacing
it with the openstack client "image show" command in our docs.

Closes-Bug: #1582211
Change-Id: I857d105a7868a610a4d97516117840cc4309c51d

bacaldwell/ironic,SauloAislan/ironic,openstack/ironic,pshchelo/ironic,SauloAislan/ironic,NaohiroTamura/ironic,bacaldwell/ironic,NaohiroTamura/ironic,openstack/ironic,devananda/ironic,pshchelo/ironic