Allow custom names for jobstats
Allow custom names for jobstats

Unique Prometheus names can now be specified for jobstats by updating the 'promName'
attribute in the metric initialization section.

Signed-Off-By: Robert Clark <7c14d1a4545e13ae720a6e883d6f0c4147a01446@hpe.com>

HewlettPackard/lustre_exporter