Bug 6229

Bug 6239

backport of 03ada72e

Bug 5682

Bug 5682 and 4584

Backport of ba07a6e09b6071

other than knl.

Bug 5603

Bug 5603

This patch also simplifies the code using bit_cnt instead of
_bitstr_bits().  This isn't really necessary, but does look cleaner.

Bug 6216

Bug 6420

Continuation of 2 commits ago.

Bug 6159

Continuation of last commit

Bug 6159

It was using the local cluster, sending the query to the wrong table

Bug 6159

bug 6116

bug 6116

Bug 6237

if OverTimeLimit is Unlimited.

Bug 6093

Update slurm.spec and slurm.spec-legacy as well.

Bug 6029.

The cpu frequency set by the user is not exact with current kernels.
There seems to be a fair variation depending upon timing and other
events. This is resulting in test1.76 failing sporatically. This
changes the logic to retry if the frequency differs by more than
10 percent rather than failing immediately.

Bug 6029

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.

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

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

Bug 5836.

Bug 6162

Bug 6163

Backups already run it when dropping to backup.

Bug 6098.

Remove the README and point to the web page.

Add details on the disable_x11 option.

Bug 5936.

Also throw an error message within stepd_available() if the nodename
is not set or cannot be inferred correctly.

Bug 5399.

Spelling, suggestions, trailing whitespace.

Bug 6044

Bug 6120