Merge branch 'slurm-2.4'

NEWS

doc/man/man1/sbatch.1

doc/man/man3/slurm_allocate_resources.3

slurm/slurm_errno.h

src/common/slurm_errno.c

src/common/slurm_protocol_api.c

src/common/slurm_protocol_pack.c

src/common/slurm_protocol_util.c

src/plugins/select/bluegene/bl/bridge_linker.c

src/plugins/select/bluegene/runjob_plugin.cc

src/slurmctld/proc_req.c

src/slurmd/slurmd/req.c

src/slurmd/slurmstepd/slurmstepd.c