This plugin is no longer used and conflicts with Ansible 2.4. Master
has recently moved to Ansible 2.4 and placed all of the group_vars back
into the inventory path. Being that the plugin is no longer required
and results in a runtime warning[0] it's being removed.
[0] - http://paste.openstack.org/show/628674/
Change-Id: If91214dd2d2a36da82e5433a3a4a36c3946cbf4e
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>