- add new configuration parameters MCSPlugin and MCSParameters
  (MCS logic can be disabled/enabled/enabled-on-demand)
- add mcs_label to jobs and nodes related structures
- add --mcs-label option to srun,salloc,sbatch as well
  as MCS information in the various Slurm commands
- initial none/user/group MCS plugins
- add squeue/sinfo optional filtering based on MCS labels

This reverts commit 9ea3e728.

Disable srun --bcast option test if SlurmdUser != root as the
  operation/test  will not work otherwise.

This would have helped to identify the performance issue associated
with bug 2174

This reverts commit 9768e31f.

sacctmgr output used a suffix of "PU" for per user, but only
  accepted input with a suffix of "PerUser". The output all
  used a suffix of "PU". The code has been modified to accept
  both sufficies (e.g. MaxJobsPerUser=# or MaxJobsPU=#).

bug 2147

BurstBuffer/cray: Fix job record purging if cancelled from pending state.
The problem can occur when the a burst buffer record was created for
the job in the plugin data structure, but no burst buffers were actually
allocated for it.
bug 2165

BurstBuffer/cray: Enable clearing of burst buffer string on completed job
    as a means of recovering from a failure mode.
Format is "scontrol update jobid=### burstbuffer=".
partial resolution of bug 2165

Conflicts:
	src/slurmctld/proc_req.c
	src/slurmd/slurmd/req.c

This is a backup in the event that slurmstepd fails in such a
  fashion that nothing gets logged. Added to help diagnose
  bug 2028

bug 2028

BurstBuffer/cray: Add logic to terminate dw_wlm_cli child processes at
    shutdown.
bug 2166

Previous logic required the buffer name to work
bug 2167

Distinguish between job and step IDs in sbcast (or srun --bcast)
  logs.

Conflicts:
	META
	NEWS
	doc/man/man1/srun.1
	slurm.spec
	src/sbcast/sbcast.c

bug introduced in commit 06b54823

Added srun option of --bcast to move executable file to compute nodes

burst_buffer/cray: Support file staging when job lacks job-specific buffer
    (i.e. only persistent burst buffers).
bug 2113