Previous select/cons_tres logic would allocate one CPU per task on the node

Bug 6981

Modify task layout with --overcommit option plus a heterogeneous job
    allocation so that a cyclic task distribution can start happening before
    all CPUs on all nodes are fully allocated. The number of tasks per node
    will be unchanged from the previous algorithm, but tasks will be distributed
    in a cyclic fashion first and then extra tasks placed on nodes with more
    CPUs. Previously all CPUs would be fully allocated in a cyclic fashion,
    then excess tasks distributed evenly across all allocated nodes.
Bug 6981

OpenMPI can only run in multi-slurmd mode if no more than one node has
more than one task. Individual nodes with more than one task use shared
memory for communications and if more than one node is doing that, their
shared memory use collides. That means these MPI tests will work if five
nodes or more are available, otherwise some tests will fail. See test1.117
for a variation of this test that will work with OpenMPI and multi-slurmd
mode.

Bug 6969.

Bug 6969.

Add warning to slurm.h.in that no new reservation flags can be
stored in slurmdbd in 19.05. (Although they could still be used by
slurmctld without issue.)

Note that the underlying RPC still uses uint32_t, but this will be
changed before 20.02 on master, and changing the column to uint32_t
in 19.05 just to change it again in 20.02 is best avoided.

Bug 6969.

OpenMPI can only run in multi-slurmd mode if no more than one node has
more than one task. Individual nodes with more than one task use shared
memory for communications and if more than one node is doing that, their
shared memory use collides. That means these MPI tests will work if five
nodes or more are available, otherwise some tests will fail. See test1.117
for a variation of this test that will work with OpenMPI and multi-slurmd
mode.

replace spaces with tabs in test

a job with --gpus=1 --nodes=2 is not currently supported

proctrack/cray plugin renamed to proctrack/cray_aries

Note that configure option --enable-native-cray has been removed

Free format_list, plugin_id_select_list, rpc_version_list in
 _free_cluster_cond_members().

Bug 7020.

There was a syntax error in the mysql for inserting the event records
into the event table caused by commit 3d61b6aa. The syntax error was
a semicolon in the middle of the query, for example:

insert into "voyager_event_table" (time_start, time_end, node_name,
cluster_nodes, reason, reason_uid, state, tres) values ('1538669453',
'1539298628', 'v1', '', 'cold-start', '1017', '0',
'1=8,2=4000,5=8,1001=4,1002=1');, (<... another record>);, ...

Bug 7025.

This commit caused loading usage table archive files to fail.
Specifically, wckey and assoc hourly/daily/monthly usage tables and the
cluster usage tables archive files would all fail to load.

Bug 7025.

For a stray socket, this call would cause nss_slurm to deadlock,
as any calling path that leads to slurm_conf_lock(), which will call
getpwuid(), which will re-enter the nss_slurm code, which will end up
back here but with the slurm_conf_lock already held, at which point
the process will never continue.

For nss_slurm, this means a node rebooting with stale sockets will hang
in the middle of the init process, which is a rather unpleasant experience.

So - only handle the stray socket cleanup within the slurmd process itself.

Bug 7030

It's more suitable for the purpose of checking if a file exists, plus
avoids the unnecessary struct stat variable since we don't care about
the file information.

Continuation of 1e234c3d.

Bug 6033.

Replace strncpy with xstrdup and snprintf with xstrfmtcat respectively
in _make_archive_name. This also fixes a coverity error CID 198462.

Continuation of 1e234c3d.

Bug 6033.

Continuation of 3beabdb1

Continuation of 3beabdb1

These test changes are designed to support gres/gpu configurations
where only some sockets actually have GPUs. The tests will not work
with all possible configurations, but this change will result in the
tests working in more cases.

select/cray replaced by select/cray_aries in tests

Bug 6902.

If they do not, then explicitly cancel them

Change to work on CPU-rich / memory-poor nodes.

Bug 6952.

Fix leaks of cluster_list and db_jobs_list.

Bug 6952.

No functional change.

Bug 6952.

Call _purge_known_jobs() from _get_runaway_jobs() to purge
known jobs (to slurmctld) from the list.

Removed secondary list runaway_jobs as it was no longer needed.
This also avoids leaking all the runaway_jobs.

Bug 6952.

Bug 6033.

If _get_oldest_record() finds a record to archive/purge, then archive
should always archive at least one record. If for whatever reason it
fails to archive any records (_archive_table() returns a 0), then we
don't want call continue, but want to return an error. Calling continue
to go back to the beginning of the while loop would result in an
infinite loop.

Bug 6033.

Bug 6033.