Correct sinfo sort fields options

Correct sinfo --sort fields to match documentation: E => Reason,
H -> Reason Time (new), R -> Partition Name, u/U -> Reason user (new)
Merge branch 'slurm-2.6' into slurm-14.03

Conflicts:
	src/sinfo/sort.c
Fix sinfo -R to print each node once

Fix sinfo -R to print each down/drained node once, rather than once per
partition. This was broken in the sinfo change to process each partition's
information in a separate pthread.
Merge branch 'slurm-14.03'