keystone extensions list doesn't work in v2 api

[Matt Fischer]

See also: https://bugs.launchpad.net/python-keystoneclient/+bug/1313266

Keystone extension-list doesn't work in the CLI. The API calls are being added in the above bug, then a CLI interface needs to be added here.

[Matt Fischer (mfisch)]

WIll begin work on this after https://review.openstack.org/#/c/92978/ lands.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/93574

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/93574
Committed: https://git.openstack.org/cgit/openstack/python-openstackclient/commit/?id=4ae4dc35bda42a972c1d1480e89cda67bf39636d
Submitter: Jenkins
Branch: master

commit 4ae4dc35bda42a972c1d1480e89cda67bf39636d
Author: Matt Fischer <email address hidden>
Date: Tue May 13 13:04:02 2014 -0400

    Add support for extension list

     - Add support in the common section for extension list. This only
       supports Identity for now. Once the APIs for volume and compute
       are supported in the respective APIs, they will be added. Once
       network is added to this client, it will be added (the API already
       supports it).
     - Include extension fakes for volume and compute for pre-enablement.

    Change-Id: Iebb0156a779887d2ab06488a2a27b70b56369376
    Closes-Bug: #1319115