Ansible 2.4 has changed the interface for var plugins.
Our vars plugin shouldn't be used in ansible 2.4, because the
features we were looking for are now standard.
However the plugin is still shipped. So we need to ensure
this vars plugin doesn't get loaded on ansible 2.4.
Ansible will not load a vars plugin in its plugin location
if no VarsModule is defined. This commit abuses this
mechanism to conditionally load the vars module depending on
the version, at the expense of throwing a warning in
Ansible 2.4.
Change-Id: I6e57b64c767bc0c761d61f5f5b07da4f85f1ad08
These are the plugins the OpenStack-Ansible deployment project relies
on. The plugins can be added to any Ansible project by simply cloning
this repository and setting up the ansible.cfg file to
point at them as additional plugins for your project.