Kyestone V2 support was removed in Train, so it's safe to do such cleanup.
* Functions which just return horizon settings are dropped and
the settings are referred directly now.
* The service catalog in the sample test data is updated to match
the format of the keystone API v3.
* Related to the above change of the sample service catalog,
openstack_dashboard.test.unit.api.test_keystone.ServiceAPITests is
updated to specify the region name explicitly because 'RegionTwo'
endpoint is no longer the second entry of the endpoint list in the
keystone API v3.
Co-Authored-By: Akihiro Motoki <amotoki@gmail.com>
Change-Id: Ib60f360c96341fa5c618595f4a9bfdfe7ec5ae83
ee6fa9a245