Clients in scenario manager are not getting local region configs

[Prashanth Hari]

Clients in scenario manager are failing to get the service region configs.
This is critical for multiregion scenario tests.

The fix is to add a common function to get the region information from service region configs.

How to recreate the problem ?

- Disable "region" from identity section and add "region" in service sections in tempest.conf. The tests will fail with region or endpoint not found

- Enable "region" in identity section but different "region" in service sections in tempest.conf. The tests will not consider the service specific regions.

The failure noticed for glance, swift and neutron related scenario tests.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/105782

[OpenStack Infra (hudson-openstack)]

Change abandoned by Prashanth Hari (<email address hidden>) on branch: master
Review: https://review.openstack.org/105777
Reason: This is a duplicate of https://review.openstack.org/#/c/105782/
Abandoning this.

[Prashanth Hari (hvprash)]

In multiregion setup, test_swift_basic_ops fails to identify the correct endpoint and uses the first region's endpoint.

So if we have multi regions like below and if we mentioned "region_3" in the config file, it fails to get the correct endpoint "http://swift_endpoint_3:8080/swift/v1" and uses "http://swift_endpoint_1:8080/swift/v1" instead.

                "endpoints": [
                    {
                        "adminURL": "http://swift_endpoint_1:8080/swift/v1",
                        "region": "region_1",
                        "internalURL": "http://swift_endpoint_1:8080/swift/v1",
                        "id": "cc41699ed460335548bba819224bcb52a1f16a",
                        "publicURL": "http://swift_endpoint_1:8080/swift/v1"
                    },
                    {
                        "adminURL": "http://swift_endpoint_2:8080/swift/v1",
                        "region": "region_2",
                        "internalURL": "http://swift_endpoint_2:8080/swift/v1",
                        "id": "5359fc21a39404sssf58c83ad7f07f2094a055",
                        "publicURL": "http://swift_endpoint_2:8080/swift/v1"
                    },
                    {
                        "adminURL": "http://swift_endpoint_3:8080/swift/v1",
                        "region": "region_3",
                        "internalURL": "http://swift_endpoint_3:8080/swift/v1",
                        "id": "2a922d627fa1ssd445fbb90246363243dd68d3",
                        "publicURL": "http://swift_endpoint_3:8080/swift/v1"
                    }
                ],
                "endpoints_links": [],
                "type": "object-store",
                "name": "swift"

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sean Dague (<email address hidden>) on branch: master
Review: https://review.openstack.org/105782
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

[Ken'ichi Ohmichi (oomichi)]

There is not any activity over 1 year 8 months and the base part of scenario tests(used clients are changed to tempest.lib ones from official clients) has been changed.
So this report is necessary now.