cfg: unneeded multiple inheritance

[Mark McLoughlin]

From Monsyne Dragon in https://review.openstack.org/3729

  File nova/openstack/common/cfg.py
  Line 696: class ConfigOpts(collections.Mapping, object):
  I don't think we really need to multiply inherit from 'object' here.
  esp. since collections.Mapping already inherits from object.

  While this doesn't affect anything atm, this kind of diamond inheritance may lead to some rather non-intuitive behavior if
  someone subclasses ConfigOpts in the future

[Zhongyue Luo (zyluo)]

In python=<2.6, collections.Mapping inherits from
collections.Sized, collections.Iterable, and collections.Container
which are also subclasses of object.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/4059

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/4059
Committed: http://github.com/openstack/openstack-common/commit/8f1de0c493a68eec5801037590d769e711f19127
Submitter: Jenkins
Branch: master

commit 8f1de0c493a68eec5801037590d769e711f19127
Author: Zhongyue Luo <email address hidden>
Date: Sun Feb 12 16:04:21 2012 +0800

    cfg: unneeded multiple inheritance

    Fixed bug #927650

    In python=<2.6, collections.Mapping inherits from
    collections.Sized, collections.Iterable, and collections.Container
    which are also subclasses of object.

    Change-Id: I6238c683324127abd9fb637748a10b6bdb2961e0