Identity v3 - authenticate call is confusing

[Diane Fleming]

Update the v3 authenticate call to break into separate calls for various authentication requests and responses.

[Diane Fleming (diane-fleming)]

https://review.openstack.org/#/c/230627/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/230627
Committed: https://git.openstack.org/cgit/openstack/api-site/commit/?id=19ba28ae497b120497f4fa661ca2376f57a1ce95
Submitter: Jenkins
Branch: master

commit 19ba28ae497b120497f4fa661ca2376f57a1ce95
Author: Diane Fleming <email address hidden>
Date: Fri Oct 2 15:04:13 2015 -0500

    Update Identity v3 to match spec

    Match the spec here:
    http://specs.openstack.org/openstack/keystone-specs/api/v3/identity-api-v3.html#openstack-identity-api-v3

    Updated calls, parameters, faults, descriptions, and samples for

    * API versions
    * Credentials
    * Domains
    * Endpoints
    * Groups
    * Policies
    * Projects
    * Regions
    * Roles
    * Role assignments
    & Services
    * Tokens
    * Users

    Code samples: Removed unused code samples.

    Change-Id: Ida11399456a4fa6ccff6336a02005192e1897a54
    Closes-Bug: #1448602
    Closes-Bug: #1513587
    Closes-Bug: #1512305