Kolla Ansible should deploy Glance and Cinder Backup with
S3 backend support working out-of-the-box.

The S3 backend had been re-introduced in Ussuri after being
deprecated around the Mitaka timeframe, and having some local
object storage options is nice for testing..

Closes-Bug: #1977515
Change-Id: I4ca58382d1ee568bfca2ad108495422163f81260
Co-authored-by: Juan Pablo Suazo <jsuazo@whitestack.com>
Co-authored-by: Maksim Malchuk <maksim.malchuk@gmail.com>