Support keystone region

[OpenStack Infra]

https://review.openstack.org/167941

Dear documentation bug triager. This bug was created here because we did not know how to map the project name "stackforge/python-magnumclient" to a launchpad project name. This indicates that the notify_impact config needs tweaks. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit 3cbf79dec0cd8ea4feff794040c2006cbeb3fb13
Author: Cedric Brandily <email address hidden>
Date: Thu Mar 26 11:45:55 2015 +0100

    Support keystone region

    This changes enables keystone region support using:

    * an option: --os-region-name=<region-name>
    * an env variable: OS_REGION_NAME=<region-name>

    DocImpact
    Closes-Bug: #1436774

    Change-Id: I1f82d437f05c2d96ed7ed12d22906efd00edbacb