Cause: Glanceclient's v2 commands don't support modification operations on an image's location attribute.
Consequence: Users can't modify, add, or see the location of an image.
Fix: Fix adds the following location related commands to
--location-add: Add a new location to the list of image locations.
--location-delete: Remove an existing location from the list of
--location-update: Update the metadata of existing location.
Result: The image location attribute can now be added, deleted, and viewed via those commands.