Enable Redis as caching backend in Kolla Ansible

Registered by Matúš Jenča

In our Openstack cloud, we need TLS enabled communication between OS services and caching database. Currently used memcached does not support TLS, so we decided to use Redis, which is supported as caching backend by Openstack oslo.cache library but is not configurable with Kolla ansible.
Here are proposed changes to code we tested internally:
https://github.com/SovereignCloudStack/kolla-ansible/pull/1/files (TLS not yet implemented)

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Matúš Jenča
Direction:
Needs approval
Assignee:
Matúš Jenča
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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