If an attempt is made to submit a job explicitly using a job ID that already exists, then do not try to purge and re-use it, but return an error. The slow clean-up of job steps on Cray systems due to node health check makes me wary of preserving the existing code. Returning an error seems a safer option.

Call delete_step_records() before clearing the job's JOB_COMPLETING
state flag. This would make a difference in the case of jobs automatically
requeued based upon their exit code, but probably not in other cases.
Also in the select plugins, check not only for a job state of JOB_COMPLETING,
but also FINISHED states. In either case, we are not in a position to
gracefully clean up the step.

Fix race condition in CPU frequency set with job preemption.
When the preemptor job completed, it would notify the srun, which
would notify the slurmctld, which could resume a preempted job.
That preempted job could reset the CPU frequency before the
preemptor. This change has the slurmstepd resetting a job's
CPU frequency prior to notifying srun of completion, which
eliminates the race condition.
bug 1011

This corrects logic added in commit
738913fa
for BGQ systems only

This helps reduce a race condition reported in test1.64. Log termination
message right away rather than trying to terminate the job and then
log the event before the srun program exits

Previous logic did not work properly to allocate specific GRES
model types to job steps from the matching job model types.

Broken in the course of adding support for GRES type field
bug 633

Conflicts:
	src/common/gres.c

Add logic to confirm that gres bitmaps exist before trying to use
them. We haven't seen this failure mode in v14.03, but in v14.11.

Conflicts:
	src/slurmctld/job_mgr.c

database index for the array elements avoiding duplicate database values.

Issue single RPC to update a job array and return separate
error codes as needed.

Scontrol modified to print separate error messages for job arrays with
different exit codes on the different tasks of the job array. Applies to
job suspend and resume operations.

This will set/export only specific environment variables

Super long line, missing new line

This was generated in the course of buildign test7.17, that calls
libslurm.o functions directly.

job elapsed time.

Previous logic could miss master pending job array record

Conflicts:
	src/slurmctld/job_mgr.c
	src/slurmctld/node_scheduler.c

the i/o thread.