Fix for OOM notification for step within a batch job

slurm/slurm.h.in

src/plugins/accounting_storage/mysql/as_mysql_job.c

src/slurmctld/job_mgr.c

src/slurmctld/proc_req.c

src/slurmctld/slurmctld.h

src/slurmctld/step_mgr.c

src/slurmd/slurmd/req.c

src/slurmd/slurmstepd/mgr.c