Slurm job template: how a job can probe instance topology and hostname-instanceid mappings…

[verdimrc]

Issue #, if available: N/A

Description of changes: a sample template on writing Slurm job that probes ec2 informations, so that job logs contain as much info as possible for later analysis.

• check instance topoloty
• display the mapping between hostname (of allocated nodes) and their instance id.

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