Modify the functions in gres/mps to match changes implemented
in commit 5d40d5dc863446ff6

Add step_configure_hardware() to GRES plugin API.
Call step_configure_hardware() from stepd and make sure it's root.
Sort frequencies returned by NVML.
Update GRES-related docs.
Document step_configure_hardware() and get_devices().
Test the bubble sort algorithm.
Update test 39.9 to work with new code.
Remove vestigial references to volts in the docs.

Only print a warning for 18.08. If a user has SLURM_MEM_PER_CPU or
SLURM_MEM_PER_NODE environment variables set for some reason this
situation could be happening by accident, and we don't want to prevent
the srun command from launching steps at this point.

Bug 6058.

Bug 5648.

Remove restriction on port count previously added in 620f92f7.

gres_plugin_job_state_validate() modified in commit a44297e5
to add tres_freq field. This changes the test to match.

Disable request for both gres/mps and gres/gpu in a single request.
Also disable request for gres/mps and --gpu-freq,
disable mps-per-job with more than 1 node,
disable mps-per-socket with more than 1 socket, and
disable mps-per-task with more than 1 node.
Note these mps-per-* options are not currently available,
but data structures do exist to implement them.

The Linux kernel default hard limit of 4096 for the number of file
descriptors is quite small. Debian/Ubuntu have for a long time
overridden this, increasing it to 1M. Recently systemd also bumped the
default to 512k.

https://github.com/systemd/systemd/blob/master/NEWS

https://github.com/systemd/systemd/pull/10244

https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/ZN5TK3D6L7SE46KGXICUKLKPX2LQISVX/

https://github.com/systemd/systemd/commit/09dad04c49cae3ad2b319c9b4e7773fedd34309a

Here the limits are increased as follows:

- slurmd: 128k; some workloads like Hadoop/Spark need a lot of fd's,
  and recommend that the limit is increased to at least 64k.

- slurmctld: 64k; per the Slurm high throughput and big system guides
  which recommend a file-max of at least 32k.

- slurmdbd: 64k, matching slurmctld, though slurmdbd shouldn't need
  that many fd's, bumping the limit shouldn't hurt either.

Bug 6171

This makes it easier to pass string literals to slurm_perror(3).  For
example, a recent GCC emits the following when a string literal is passed
in C++:

   ISO C++ forbids converting a string constant to 'char*'

Bug 6082

Bug 5248

Bug 6055

Add the following slurmctld return codes to the lua plugin:

  ESLURM_ACCESS_DENIED
  ESLURM_ACCOUNTING_POLICY
  ESLURM_INVALID_NODE_COUNT
  ESLURM_JOB_MISSING_SIZE_SPECIFICATION
  ESLURM_MISSING_TIME_LIMIT

Bug 6055

Rework one timer error message while here.

Bug 5861.

Bug 6013

The GRES node information in slurmctld is now as we want it to be.
No job/step scheduling logic implemented yet.

Previous logic was printing a uint64_t as %lld and the test was
looking for a negative number. This corrects the test.

Test was sometimes failing due to delay in getting job accounting
data to database.

Use __func__, collapse message format to a single line as well.

Ensure _GNU_SOURCE is defined. For FreeBSD or NetBSD, define it
as equivalent to POLLHUP up front, rather than the #ifdefs inline.

Remove config.h include, it is not needed here at this point.

Also add plugin name to some logs

Bug 5836.

Wrong author.

This reverts commit e1c10fea.

Bug 5836.

Bug 5836.

Bug 6162

much work still required

Required for gres/mps

Also internally sort GresTypes so that the gres/gpu plugin is processed
before gres/mps. gres/mps will leverage the gres/gpu plugin.

Bug 6163

Backups already run it when dropping to backup.

Bug 6098.