PMIX_VAL_SET will not be supported in PMIx v4 or later. This commit changes
the use of the old (and non-standard) PMIX_VAL_SET macro to the standardized
PMIX_INFO_LOAD (which is used within a new internal PMIXP_KVP_ADD macro).

Bug 6624.

Bug 6824.

PrologFlags=x11 is incompatible with proctracktype=proctrack/linuxproc
because linuxproc cannot kill processes not owned by the user, and root
owns processes spawned for handling x11 forwarding.

When using PrologFlags=contain, it is recommended to use
proctrack/cgroup or proctrack/cray because contain is mostly useful for
pam_slurm_adopt which requires proctrack/cgroup or proctrack/cray.

Bug 6824.

Commit f293a763 caused slurmctld to fatal when proctrack/cray and
PrologFlags=Contain are both in slurm.conf. proctrack/cray should be
allowed with PrologFlags=contain.

Bug 6824.

This commit changes the logic of selecting a type of collective. The
Tree-based algorithm will be selected when fence with an empty data
contribution, which allows for improved fence performance.

Bug 6637.

Bug 6411.

Any srun command launched within a shell under pam_slurm_adopt's control
will automatically use the job's allocation now.

Bug 6411.

Should fix build errors with 'make contrib'.

Continuation of 36c30487

Bug 6782

Bug 6633.

Regression in eee05efb.

Bug 6801.

Bug 6920

Bug 6290

Bug 6791

Bug 6791

Bug 6791

This is to prevent defaults from overriding the incomplete set of options
that have been populated from the environment, vs. some options that will
be determined from job_desc_msg_t once fetched from the controller.

The post_submit() hooks integrate jobid/stepid information to allow
detailed logging - requires pre_submit() to generate an intermediate
message while the option data is still in the most raw form, which
the plugin can save and post_submit() can then log as needed.

Since post_submit() cannot safely read datastructures, plugins will
need to store data between pre_submit and post_submit. Since calls
are done multiple times - once per jobpack - need to allow plugin
to keep state in terms of which pre/post submit calls are for which
job pack.

The cli_filter pre_submit() hooks are the primary location for cli_filter
read and processing of options.

These allow a plugin to change the default values for the cli options to
different values based on site policy or user needs.

Moved spank_init_post_opt() calls to just before cli_filter pre_submit
hooks in service of that.

These are primarily intended to allow cli_filter plugins to generically
get and set values for any given option. They are implemented here because
the slurm_cli_opt_t datastructure and common_options data structures are
statically defined within slurm_opt.c.

Use lib_LTLIBRARIES instead of pkglib_LTLIBRARIES to avoid being installed
under the lib/slurm/ directory.

Change to -shrext .so.2 -avoid-version to install once, and avoid libtool's
automatic versioning. (Idea borrowed from nss-mdns's Makefile.am .)