Cannot use --os-auth-token with v2 client

[Stuart McLaren]

If you provide --os-auth-token to the glance v2 client it will fail.

$ glance --os-auth-token eed45af04f3d40baaae091f050a54cef --os-image-url http://localhost:9292 image-show 1ee7af78-4c66-4c48-bf70-eebfac578a8b
WARNING: The client is falling back to v1 because the accessing to v2 failed. This behavior will be removed in future versions
HTTPMultipleChoices (HTTP 300) Requested version of OpenStack Images API is not available.

[Stuart McLaren (stuart-mclaren)]

(If the v1 server is running the command may or may not fall back to v1 depending on whether the arguments are compatible or not.)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/219686

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/219686
Committed: https://git.openstack.org/cgit/openstack/python-glanceclient/commit/?id=1322fbc5d8323ff605c8b399fe0e1cb904b44f4e
Submitter: Jenkins
Branch: master

commit 1322fbc5d8323ff605c8b399fe0e1cb904b44f4e
Author: Flavio Percoco <email address hidden>
Date: Wed Sep 2 14:58:59 2015 +0200

    Consider `--os-token` when using v2

    The `_cache_schemas` call currently forces authentication even when the
    `auth_token` and `os_image_url` are passed. Instead of handling forced
    authentications, let the client use the passed arguments and
    authenticate only once if needed.

    This was not caught by the existing tests because the call to
    `_cache_schemas` was mocked.

    Change-Id: I93cec9a68cafc0992d14dab38114d03e25f1e5da
    Closes-bug: #1490462