Inactive oauth extension creates dependency on httplib2

[Adam Young]

The dependency resoution in Keystone requires that an object be explicitly instantiated prior to use. Extensions fall into this category. They are referenced in keystone/serivce.py such as:

from keystone.contrib import endpoint_filter
from keystone.contrib import oauth1

These components pull in other dependencies. In the case of oauth, it is httplib2.

We can extend this method

https://github.com/openstack/keystone/blob/master/keystone/common/wsgi.py#L536-L563

here

https://github.com/openstack/keystone/blob/master/keystone/contrib/oauth1/routers.py#L21

And activate the Manager upon creating of the routes, which indicates they will actually be used in the deployment.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/46334

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/46797

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/46363
Committed: http://github.com/openstack/keystone/commit/5e04343ff5b5f6f7ac896492ebdb4f992d07be47
Submitter: Jenkins
Branch: master

commit 5e04343ff5b5f6f7ac896492ebdb4f992d07be47
Author: Brant Knudson <email address hidden>
Date: Thu Sep 12 16:07:13 2013 -0500

    Optional dependency injection

    This adds support for optional dependencies using Keystone
    dependency injection.

    A new decorator for classes is provided.

     @dependency.optional('optional_api_1', 'optional_api_2')

    If there's a provider for the dependency, the attribute
    will be set to the provider instance, otherwise the attribute
    will be set to None.

    This can be used in combination with required dependencies.

    Related-bug: #1223524
    Change-Id: I2b987f10a7bc85efab136ae9e84606e666494246

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/46797
Committed: http://github.com/openstack/keystone/commit/acd70e5641a81f9e0333dfc495ac38cadaa450df
Submitter: Jenkins
Branch: master

commit acd70e5641a81f9e0333dfc495ac38cadaa450df
Author: Adam Young <email address hidden>
Date: Mon Sep 16 15:20:39 2013 -0400

    oauth using optional dependencies

    Bug 1223524

    Change-Id: Ic0d53fd1d5b3b7a587d33dc230e9ff200782ad4f