Make it so previous versions of salloc/srun work with newer versions
of Slurm daemons.
Addition to 61db2e344368751caa6a693bc7a54d2bf5d059a2
Merge remote-tracking branch 'origin/slurm-14.03' into slurm-14.11
Merge remote-tracking branch 'origin/slurm-14.11'