Upstream removed the api_version configuration option and started
to expect the version to be encoded in the Keystone URL at Rocky.
Add S3 API functional test.
Remove invalid configuration items in the s3token section.
Remove configuration templates for OpenStack versions prior to
Mitaka.
Change-Id: Ia3306441222f7c078d460c659701a57a5944c928
Func-Test-Pr: https://github.com/openstack-charmers/zaza-openstack-tests/pull/194
Closes-Bug: #1867373
ed9051a9f3