Add new command, sdiag, which reports a variety of job scheduling
statistics. Based upon work by Alejandro Lucero Palau, BSC.

with no explanation.

change happened and would close up on reservations.

change happened and would close up on blocks.

change happened and would close up on nodes.

change happened and would close up on jobs.

change happened and would close up on partitions.

In commit

 commit b33cd7c8
 Author: Mark A. Grondona <mgrondona@llnl.gov>
 Date:   Fri Oct 7 13:52:43 2011 -0700

a minor bug was introduced because the io_dup_stdio() call was moved
out from under the 'else' case of the empty if

 if (job->pty && (task->gtid == 0))

in task.c:exec_task() This results in the error

 dup2(stdin): Bad file descriptor

For task 0 when --pty is used, because io_dup_stdio() is
inappropriately being called after login_tty().

This patch collects the stdio setup into prepare_tty(), renames
that function prepare_stdio(), and removes the io_dup_stdio()
call from exec_task().  This removes the last io_* call from
slurmstepd/task.c, so the io.h header is removed.

I didn't see a problem with moving the io_dup_stdio() call earlier in
the task setup path, but it could probably use another set of eyes.
----------
Note: This problem was at least partly fixed with
https://github.com/SchedMD/slurm/commit/4d17300c5de7a8f146072bae8baaf773ca1fe98a

Before it didn't handle a mixed state correctly at all.

the slurm.conf file being correct.

the slurm.conf

job allocation around.