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
42 files changed