Fix issue where user is requesting --acctg-freq=0 and no memory limits.
Merge remote-tracking branch 'origin/slurm-2.6' into slurm-14.03

Conflicts:
	src/slurmd/slurmstepd/slurmstepd_job.c
BGQ - Temp fix issue where job could be left on job_list after it finished.
Handle node ranges better when dealing with accounting max node limits.

This is for bug 775
Merge remote-tracking branch 'origin/slurm-2.6' into slurm-14.03
Merge remote-tracking branch 'origin/slurm-14.03'