Authenticate local users via federated workflow

[OpenStack Infra]

https://review.openstack.org/156308
commit 717206bc70de1833b02a57529a6cdaf6e5675ea8
Author: Marek Denis <email address hidden>
Date: Mon Feb 16 18:37:16 2015 +0100

    Authenticate local users via federated workflow

    Mapping rules can specify that effective users should be local users
    with all their roles. For that we need a way to distinguish which flow
    should be choosen (user is either ``ephemeral`` or ``local``). This patch
    correctly interprets mapped properties and sets authentication context
    so either workflow goes as ephemeral or local user.
    As part of the required work, class UserAuthInfo was moved from
    ``keystone/auth/plugins/password.py`` to
    ``keystone/auth/plugins/core.py`` and is now accessed after importing
    ``keystone.auth.plugins`` module.

    DocImpact
    Change-Id: I90b7408a9905aa96387414d9250b410b28eff485
    Partially-Implements: bp federated-direct-user-mapping

[Alexandra Settle (alexandra-settle)]

Federated keystone documentation is here: http://docs.openstack.org/security-guide/identity/federated-keystone.html