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

No change to document contents, just reorded the fields documented.

bug 2143

Always log some operations (previously logging was only triggered
  by long run time of the operations)
Log some operations with info() rather than debug() for DebugFlags=
  burstbuffer

test more association/qos limits before reserving resources for a
  pending job. This complements commit dcc943b7
bug 2129

Backfill scheduler: Test association and QOS node limits before reserving
    resources for pending job.
bug 2129

Bug 1493

Prevents the following sequence from causing a segfault:
$ scontrol create partitionname=stuff nodes=ALL
$ sbatch --wrap="hostname" -o/dev/null -p stuff
Submitted batch job 1047468
$ scontrol delete partitionname=stuff
$ scontrol update jobid=1047468 partition=stuff