Add service providers integration tests

This patch adds the tests for the Service Provider API (part of
the Federated Identity API).

To run the tests install keystone and run (in tempest):

    $ tox -e all-plugin -- keystone

Change-Id: I6d6f44736e4187dd2a500c7c0b6715e52296a9b3
7 files changed
tree: d974c7d42a6fb1e4a56ed58b09686af4ef48a648
  1. keystone_tempest_plugin/