Release version 0.0.8.

Change-Id: I16c1e5a55ed873716893ea42c35d74d919b6add5
Reviewed-on: https://review.openstack.org/23447
Reviewed-by: Anita Kuno <akuno@lavabit.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins