Add sprio --local and --sibling options for use in federation of clusters.

Add sprio -p/--partition option to filter jobs by partition name.
Add partition name to job priority factor response message.

Modify backfill logic so that bf_max_job_user, bf_max_job_part and
    bf_max_job_user_part options can all be used independently of each other.

Add SchedulerParameters option of bf_max_job_user_part to specifiy the
    maximum number of jobs per user for any single partition. This differs from
    bf_max_job_user in that a separate counter is applied to each partition
    rather than having a single counter per user applied to all partitions.

The problem will be solved by using per-partition QOS and setting
MaxJobPer[User|Account] on that QOS.
bug 3668

This was a regression in commit 1967d512.

Bug 3650

Add SchedulerParameters option of bf_max_job_user_part to specifiy the
    maximum number of jobs per user for any single partition. This differs from
    bf_max_job_user in that a separate counter is applied to each partition
    rather than having a single counter per user applied to all partitions.

specify --with-pmix.

Bug 3597

This makes it so you can also specify %slurm_with_pmix in .rpmmacros to specify
a non-standard pmix installation.

About "MCSParameters=ondemand,noselect:groupA|groupB|groupC",
you can separate ondemand,noselect and groupA|groupB|groupC into 2
parameters like you want. The first part is common for mcs plugin and
the second part is only for mcs/group, so it could be logical to put them
into 2 different parameters.

Bug 3428

the slurmctld.

This reverts commit a662a226.

the slurmctld.

Prior security check only permitted root or the SlurmUser to update.

Bug 3631.

This introduced a race condition between RPC messages starting
to be processed ahead of the plugin init() calls completing.

This reverts commit 6e65b5cb.

Bug 3646.

Only happens in a SPANK plugin on the setenv() call.
dyn_spank_set_job_env() in unaffected, and needs the NULL value for proper
backwards-compatibility.

Bug 3503.

Add squeue --local and --sibling options to modify filtering of jobs on
    federated clusters.

Modify slurm_load_jobs() function to load job information from all clusters
    in a federation.

Fix double free issue from commit 3851f619

Same issue from fixed in a different spot with b19637bd.

Bug 3617

This reverts commit 8343365f.

Fix double free issue from commit 3851f619

Same issue from fixed in a different spot with b19637bd.

Bug 3617

steps.

bug 3610

Bug 3097

Fix correct macro this time, Tim Wickberg's fault for prior failed patch.

Bug 3605.

This reverts commit 53523c54.

Bug 3605.