Apply cookiecutter to newly split project

This tempest plugin is being split out of the main keystone project in
accordance with Queens goal "Split Tempest Plugins into Separate
Repos/Projects"[1]. This patch applies the standard boilerplate files
for OpenStack projects so that it can stand on its own.

[1] https://governance.openstack.org/tc/goals/queens/split-tempest-plugins.html
diff --git a/README.rst b/README.rst
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+===============================
+openstack
+===============================
+
+Tempest plugin keystone_tempest_plugin
+
+Tempest plugin for functional testing of keystone's LDAP and federation
+features. More information can be found in the `keystone developer
+documentation`_.
+
+.. _`keystone developer documentation`: https://docs.openstack.org/developer/keystone/devref/development_best_practices.html#api-scenario-tests
+
+* Free software: Apache license
+* Documentation: http://docs.openstack.org/developer/openstack
+* Source: http://git.openstack.org/cgit/openstack/keystone-tempest-plugin
+* Bugs: http://bugs.launchpad.net/keystone_tempest_plugin