endpoint list should support filtering by region v3

[Takahiro Shida]

keystone endpoint-list is filtered by interface and service_id at v3 API.
http://api.openstack.org/api-ref-identity.html

Endpoint also has a region information, so it should be filtered by region as same as interface and service_id.

[Dolph Mathews (dolph)]

The v3 keystoneclient lib already supports this with something like:

  c.endpoints.list(region='north')

Will emit a request like:

  GET /v3/endpoints?region=north

And the service should return a filtered collection accordingly.

The CLI command "keystone endpoint-list" only uses v2, though. Instead, this v3 feature is exposed by "openstack --os-identity-api-version=3 endpoint-list" (in python-openstackclient), which doesn't appear to support a --region parameter.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/114910

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/114910
Committed: https://git.openstack.org/cgit/openstack/python-openstackclient/commit/?id=181f16da8a2433809d319441d8261b908faf2dd9
Submitter: Jenkins
Branch: master

commit 181f16da8a2433809d319441d8261b908faf2dd9
Author: wanghong <email address hidden>
Date: Mon Aug 18 16:41:15 2014 +0800

    add service/interface/region filter for endpoint v3

    Change-Id: I7eac5b2ff5f5a6f3f08b22dd3a48a5ae7e2c056b
    Closes-Bug: #1281888