Adding THT support for Cinder backup Google cloud driver

[Tzach Shefi]

Currently THT only supports three Cinder backup driver back ends: Swift, NFS, Ceph.
Google cloud backup driver should be added as a new forth supported driver.

Version:
openstack-tripleo-heat-templates-8.0.4-20.el7ost.noarch

Temp workaround, when calling Swift and Cinder backup driver and then substituting it with Google driver things work.

Steps to reproduce for instance if you use such a yaml, don't forget to test this out you also need to provide A Google auth file but that is none relevant as the THT code doesn't like or know this bit:
backup_driver
            value: cinder.backup.drivers.google

#cat gcs-backup.yaml
parameter_defaults:
  ControllerExtraConfig: # 1
    cinder::config::cinder_config:
        DEFAULT/backup_driver
            value: cinder.backup.drivers.google
        DEFAULT/backup_gcs_credential_file
            value: /etc/cinder/gbackup.json (-> path is correct under docker)
        DEFAULT/backup_gcs_bucket
            value: mycinderbucket
        DEFAULT/backup_gcs_project_id
            value: cloud-backup-1370
        DEFAULT/backup_gcs_user_agent
            value: myuseragent

Where as if I keep Swift and later replaced with Google deployment/backup worked,using below yaml.

cat gcs-backup.yaml
parameter_defaults:
  ControllerExtraConfig: # 1
    cinder::config::cinder_config:
        DEFAULT/backup_gcs_credential_file:
            value: /etc/cinder/gbackup.json
        DEFAULT/backup_gcs_bucket:
            value: mycinderbucket
        DEFAULT/backup_gcs_project_id:
            value: cloudforms-validation
        DEFAULT/backup_gcs_user_agent:
            value: gcscinder
    cinder::backup::swift::backup_driver: cinder.backup.drivers.google

^ last line overrides Swift with missing Google driver.

[Juan Antonio Osorio Robles (juan-osorio-robles)]

Is this something you still would want?

[Tzach Shefi (tshefi)]

Yes I'd still like to see this happen,
mostly to help customers deploy with it.

How many of them use Google backup, I don't know.