Avoid calling jobacct_gather_g_getinfo() until there is data to read from the socket.

In current version of slurm initscript, a stop action returns a
non null exit code as slurmstatus exit code is directly used and
the daemons are stopped.
Ensure that when called from slurmstop, slurmstatus error code is
reversed to correctly match the attended error code of the stop
stage.

When multiple slurmd is enabled, there is no way in the prolog
and epilog scripts associated to the slurmd daemons to determine
which node, either virtual or physical is associated to the
execution. SLURMD_NODENAME will provide that information, that is
to say the name of the virtual or physical SLURM node at the origin
of the prolog/epilog execution.

When cpuset is used as the task/affinity backend, a common root
directory is used to group every cpuset subdirectories created
by the plugin. With multiple slurmd support, this result in all
the virtual nodes executing on a same physical node sharing the
same cpuset directories. This patch make sure that every virtual
node has its own root directory in the cpuset hierarchy.

patch-src_sbatch_sbatch.c from Aleksej Saushev.

patch-src_salloc_salloc.c from Aleksej Saushev.

patch-src plugins accounting  storage filetxt filetxt  jobacct  process.c
Patch from Aleksej Saushev.

patch-src_common_jobacct__common.c from Aleksej Sauchev.

Patch from Aleksej Saushev.

Add test7.15 to test for any signals blocked by default in job tasks.

It was found that slurmstepd was intermittently leaving SIGPIPE
blocked when launching user tasks. This may have something to do
with the fact that the xsignal_unblock() call in _fork_all_tasks()
is referencing an extern array (nominally this should have unblocked
SIGPIPE), but I didn't spend the time to fully track this issue
down. Instead, I figured there is probably no reason we would _not_
want to unblock *all* signals, so this patch does that.

Before this change, the following program fails every once in awhile:

 #include <stdio.h>
 #include <signal.h>

 int main (int ac, char **av)
 {
	int i, rc = 0;
	struct sigaction act;
	for (i = 1; i < SIGRTMAX; i++) {
		sigaction (i, NULL, &act);
		if (act.sa_handler == SIG_DFL)
			continue;
		fprintf (stderr, "Signal %d appears to be ignored!\n", i);
		rc = 1;
	}
	return (rc);
 }

with:

 srun -N1 -n1 ./test
 Signal 13 appears to be ignored!

after the change, the program succeeds.

number.

This new sbatch option allows the user to specify a file containing
environment variables to be used in the jobs execution environment.

Let operators see reservation data even if "PrivateData=reservations" flag
is set in slurm.conf. Patch from Don Albert, Bull.

Make slurmd -C output print "CPUs=" rather than "Procs=" to match
current slurm.conf standard

It used to be listed as "--switch=" rather than "--switches="