Correct plugin race condition introduced in

src/common/gres.c

src/common/mpi.c

src/common/node_select.c

src/common/slurm_accounting_storage.c

src/common/slurm_auth.c

src/common/slurm_jobacct_gather.c

src/common/slurm_priority.c

src/common/slurm_topology.c

src/common/switch.c

src/slurmctld/job_submit.c

src/slurmctld/sched_plugin.c