[IT] MapR unit tests setting os_region_name incorrectly

[Trevor McKay]

Some of the MapR plugin unit tests assign os_region_name directly. This breaks the __gettattr__ behavior for config options in oslo.config, so overrides are not seen. When the MapR tests run first in a worker which later runs tests using os_region_name overrides, those tests fail (for example, test_url_for_regions).

The MapR tests should not set the value at all (the default None, set to None) or should set the override value

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/130628

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/130628
Committed: https://git.openstack.org/cgit/openstack/sahara/commit/?id=ef1283311946c019b4512090e51da06a3bc694c0
Submitter: Jenkins
Branch: master

commit ef1283311946c019b4512090e51da06a3bc694c0
Author: Trevor McKay <email address hidden>
Date: Thu Oct 23 15:33:47 2014 -0400

    Remove explicit set of CONF.os_region_name in mapr plugin tests

    The explicit set of os_region_name to None breaks subsequent
    unit tests running in the same worker process that attempt to
    override os_region_name. Any setting of os_region_name in unit
    tests should use the set_override or set_default methods available
    in oslo.config.

    Close-bug: 1384875
    Change-Id: Iea2eb58dc3d8e8667795495c6cc1f68538d524b6