Add support for location parameters in v2 commands

[OpenStack Infra]

https://review.openstack.org/72539
commit 323d32cc6d28434ad57f3ddd5253b9a8950b4c8a
Author: David Koo <email address hidden>
Date: Tue Feb 11 11:06:02 2014 +0800

    Add support for location parameters in v2 commands

    Currently glanceclient's v2 commands don't support modification
    operations on an image's location attribute - the argparse specification
    for the location attribute of the image-update command causes the image
    id argument to be included in list of locations and so the command
    parsing fails (because it causes the image id to appear to be missing).

    Furthermore even if the 'locations' argument were to be accepted by
    argparse (e.g. by changing the argument specs and using --id to specify
    the image id) the command would still fail because the arguments are
    passed directly to the schema which expects the value of the 'locations'
    argument to be a valid dictionary (there is nobody to convert the
    argument string to a python dictionary that the schema expects).

    This commit adds the following location related commands to
    glanceclient:
        --location-add: Add a new location to the list of image locations.
        --location-delete: Remove an existing location from the list of
            image locations.
        --location-update: Update the metadata of existing location.

    The glanceclient.v2.images.Controller class has been agumented with
    three new methods to support the commands listed above:
        - add_location
        - delete_locations
        - update_location

    The server has not been modified, i.e. all location related API requests
    are passed to the server via HTTP PATCH requests and handled by the
    server's image update function.

    The v2 'image' and 'shell' related tests have also been supplemented.

    Note that in order to use these options the server must be first
    configured to expose location related info to the clients (i.e.
    'show_multiple_locations' must be set to 'True").

    I also added a mailmap entry for myself.

    DocImpact
    Closes-bug: #1271452
    Co-Author: David Koo (koofoss) <email address hidden>

    Change-Id: Id1f320af05d9344645836359758e4aa227aafc69

[Andreas Jaeger (jaegerandi)]

This is in current CLI reference