CRAY - fix issue with --mem option not giving correct amount of memory
per cpu.
Disable sbcast tests for all front-end systems (e.g. Cray)
CRAY - Fix if srun --mem is given outside an allocation to set the
APRUN_DEFAULT_MEMORY env var for aprun.  This scenario will not display
the option when used with --launch-cmd.
Merge remote-tracking branch 'origin/slurm-2.5'

Conflicts:
	NEWS