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slurm-lustre-jobid_var.c - SLURM SPANK plugin Lustre jobid_var creator

This creates a new environment variable which is a concatenation of SLURM_JOB_ID.SLURM_JOB_UID.SLURM_JOB_ACCOUNT that can be used as the Lustre jobid_var environment variable. By using the SLURM SPANK Plugin API we are able to have this variable be visible in the running job's environment. The reason for having a combined variable is to provide quicker searching abilities within the Elasticsearch documents where the Lustre jobstat metrics end up being stored and analyzed.