- avoid `abort()` when collective is failed
- added logging of coll details for fail cases

Bug 5067

Note, this is setting it up so we can use defunct functions.  It will
probably need to be properly fixed in a future version so we don't
do this.

This change is associated with commit 6be109d9

gres_per_socket requires sockets-per-node count specification
gres_per_task requires task count specification
these restrictions are required in order for cons_res to
  support these options in a finite amount of time/code

Bug 5098.

with preemption or when job requests a specific list of hosts.

Bug 5293.

Coverity CID 186992

Coverity CID 186991

Pass "first_pass" and "avail_cores to _eval_nodes() so that
  the usable cores can be better identified by the GRES selection
  logic.
Add new function, _select_cores(), to select specific cores for use
Create new data structure with job multi-core spec
Permit off-socket cores to be used with enforce_bind
  Needed so that cores on and off socket can be used. Details will need
  to be handled in _select_cores()

the munge regression test7.16 would fail roughly 0.1% of the time
when modifying a bit that munge did not use. This change modifies
the test to retry once in that case.

bug 5337

Coverity 186930

When we need to drop nodes in the selection algorithm, change
from dropping low CPU count nodes to CPU+GPU count (for jobs
requesting GPUs). Not an ideal algorithm, but much better
when using GPUs.

thread

Bug 5390

Bug 5395

this logs the GPU configuration from the slurmd perspecitve.
while we don't have tools to load the information directly
from nvidia system configuration, i have confirmed where that
logic needs to go and the data structure contents.

# Conflicts:
#	doc/html/faq.shtml
#	src/slurmctld/job_mgr.c

Bug 5390

Continuation of 923c9b37.

There is a delay in the cgroup system when moving a PID from one cgroup
to another. It is usually short, but if we don't wait for the PID to
move before removing cgroup directories the PID previously belonged to,
we could leak cgroups. This was previously fixed in the cpuset and
devices subsystems. This uses the same logic to fix the freezer
subsystem.

Bug 5082.

cpuset and devices subsystems have duplicate code to cleanup the cgroup
and prevent leaking cgroups by moving the process to the root cgroup and
waiting for it to be moved.

Move this duplicate code to a common function so it can be used later by
the freezer subsystem.

Bug 5082.

Bug 5227

bug 5337

the database.

Bug 5247

Previous logic could trigger KNL node reboot when job did not
request any KNL MCDRAM or NUMA modes as features. For example:
srun -N3 -C "[foo*1&bar*2]" hostname
would trigger reboot of all KNL nodes even though no KNL-specific
features were requested. This bug only exists in v18.08 and was
introduced when expanding KNL node feature specification capabilities.

Invoke select_g_job_test() one time with all valid node rather than
multiple times when adding higher weight nodes. This results in
the job allocation always accumulating nodes from lower to higher
weights rather than possibly using mostly higher weight nodes.
It also streamlines the resource allocation process for most
configurations by eliminating some repeated logic as groups
of nodes are added for consideration by the select plugin.