Use keystone authtoken middleware confs instead of deprecated auth credentials

[Sergey Lukjanov]

Use configs from the keystone authtoken middleware (auth_uri) instead of separated auth credentials that are already deprecated. This option was deprecated and probably will be removed soon due to this fact, so, we need to use new one.

[Sergey Lukjanov (slukjanov)]

https://review.openstack.org/#/c/74688/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/74688
Committed: https://git.openstack.org/cgit/openstack/sahara/commit/?id=1c70740f7d3f3da27998f8cde58180c127d18f74
Submitter: Jenkins
Branch: master

commit 1c70740f7d3f3da27998f8cde58180c127d18f74
Author: Sergey Lukjanov <email address hidden>
Date: Wed Feb 19 16:27:43 2014 +0400

    Rework keystone auth_token middleware configs

    We're using Sahara-specific configs and there are some other potential
    inconsistencies.

    * use common OpenStack [keystone_authtoken] section for middleware
      configurations;
    * token validator reworked to be consistent with update auth_token
      middleware usage;
    * auth_uri is now stored in context for consistency, additonally, it
    * provides correct auth_uri in multi process sahara deployment.

    Closes-Bug: #1257472
    Closes-Bug: #1249063

    Change-Id: I5a33ae6269d40dadcd4893b27a937a37e0c74006