Investigate tooling for building VM images with Hestia

For the DEEP/SAGE platform we will need to integrate Hestia in a VM image.

It may be possible to build it from scratch with Ansible, if not we could use it to deploy and specify configs.

We will provision a Controller-server, Worker-server-phobos, Worker-server-motr+filesystem at least with this approach, on separate nodes. The Controller-server will also have a running Redis instance.

• Create Ansible roles for deploying hestia to Controller-server, Worker-server-phobos, Worker-server-motr+filesystem, with Redis started on the controller.
• Add more flexible configuration to allow multiple nodes with the same backend type
• Add documentation (and docker image) for running a test cluster with ansible from scratch