gres underflow error fix
this bug exists with all select plugins. if a job has been allocated gres and the gres have either topology or type information and the slurmctld daemon restarts (while the job is running), then when the job ends gres underflow errors will be generated. the problem is due to the slurmctld not having gres topology or type information available at restart time so that it can not update counters. the overhead of updating those counters at node registration time is high, so we just avoid generating the errors in this case. note: this bug is not specific to cons_tres and exists in earlier versions of slurm.
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