Cosmetic changes

No change to logic
start job in highest prio partition if possible

Start a job in the highest priority partition possible, even if it requires
preempting other jobs and delaying initiation, rather than using a lower
priority partition. Previous logic would preempt lower priority jobs, but
then might start the job in a lower priority partition and not use the resources
released by the preempted jobs.
bug 1032
Merge branch 'slurm-14.03'

Conflicts:
	src/slurmctld/job_scheduler.c