Update fatimage base to RL8.9 with robust volume mounts

[sjpb]

• Use the OpenStack volume ID to find the appropriate block device when labeling filesystem volumes. The default/skeleton Terraform variables state_volume_device_path and home_volume_device_path are no longer required and have been deleted.
• Update base image for fatimage build to RockyLinux 8.9. Note this does not itself change the RockyLinux version in the fat image, as dnf update is run during build anyway.

Fixes #327 and #343.

Details

Previously labeling relied on the ordering in /dev matching the order of the block device definitions in the terraform instance resource. This was the case for RockyLinux 8.8 images but does not appear to be the case for RockyLinux 8.9 images. Note that:

• The filesystem volume label is taken from the first word of the OpenStack volume description.
• cloud-init's runcmd happens after mounts, so bootcmd must be used to create filesystems.
• If the image has hw_disk_bus='scsi' and hw_scsi_model='virtio-scsi' properties set, entries in /dev/disk-by-id contain the full openstack volume ID (plus a prefix). Without these properties, the entries only contain the first 20 characters of the openstack volume ID. The updated approach copes with both.
• The x-systemd.required-by=nfs-server.service dependency in the home volume mount has been removed, as as required-by is not supported for RL8. See https://github.com/systemd/systemd/issues/30246. This could be reinstated for a RL9 image.
• A test set for multiple images is provided at https://github.com/sjpb/os-volume-tests

Steps

• [x] Document volume description
• [x] Build and test new image
• [x] Implement same for ansible-templated-tf in caas environment
• [ ] ~Build and CI test final image~ Not required, no other updates since build

[sjpb]

Image build (for testing, needs updating to main and rebuilding before merge): https://github.com/stackhpc/ansible-slurm-appliance/actions/runs/7141102424

[sjpb]

Manual checks on Arcus cluster at 6d632ea:

• monitoring: OK
• OOD:
  • desktop: OK (starts, terminal commands OK)
  • jupyter: OK
  • shell: OK
  • jobs: OK

[sjpb]

Checks using Azimuth at 6d632ea:

• DONE OK: deploying azimuth: http://portal.apps.128-232-226-79.sslip.io/
  • checked OK: that updated image was deployed
• DONE OK: deploy slurm w/ hpctests
• DONE OK: manual tests:
  • ssh: ok
  • OOD:
  • shell: ok
  • desktop: ok
  • jupyter: ok
  • monitoring: ok

[sjpb]

Tests on Azimith/CaaS at 9b34524:

• DONE: create cluster sb-test-2 w/ hpctests
• checked OK: deleted task not in ARA
• checked OK: control has volumes mounted
• OOD:
  • shell: ok
  • desktop: ok
  • jupyter: OK
• monitoring: ok, slurm jobs has data
• DONE: delete