Reference and include the custom CA for OCCM+CSI usage (cloud.conf)

Created by: garloff

As KaaS operator on the capi management server, I expect the custom CA to be included/referenced in cloud.conf that is used by the OpenStack Cloud Controller Manager (occm) and Cinder-CSI driver. If the inclusion is by reference to a file, this file needs to be deployed to the nodes (for CSI to the worker and control nodes, for OCCM control nodes would suffice) and be included in a volumeMount there so it is accessible.