Use sackd for the login nodes

[jvilarru]

Substitute slurmd for the sackd daemon, this way an x-login partition is not needed.

Submission Checklist

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• Fork your PR branch from the Toolkit "develop" branch (not main)
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[tpdownes]

What is the behavior of sackd when the slurmctld is non responsive? We currently configure the slurmd service unit to restart when configless slurmd fails to retrieve the configuration.

[jvilarru]

Added new commit so that at reconfigure sackd is restarted, but you have a valid point about the restart on-failure defined in https://github.com/GoogleCloudPlatform/slurm-gcp/blob/master/ansible/roles/slurm/templates/systemd/slurmd_overrides.j2 I will create a PR also on slurm-gcp for that.

[jvilarru]

Done: GoogleCloudPlatform/slurm-gcp#204

[tpdownes]

IMO this should not be merged until new images are published using

GoogleCloudPlatform/slurm-gcp#204

[mr0re1]

Waiting for images-based on 6.7.0 to be relased. DO_NOT_MERGE until then.

[mr0re1]

/gcbrun