scheduling

Add select_jobinfo to the task launch RPC so that all nodes have access to
the information and not job the head node.  Based upon patch by Andriy
Grytsenko (Massive Solutions Limited).

Needed for gang scheduling.

Fix possible invalid memory reference in sched/backfill. Patch by Andriy
Grytsenko (Massive Solutions Limited).

Add flag to the select APIs for job suspend/resume indicating if the action
is for gang scheduling or an explicit job suspend/resume by the user. Only
an explicit job suspend/resume will reset the job's priority and make
resources exclusively held by the job available to other jobs. This change
is also needed for Cray systems with ALPS.

Based upon recent experience with smap/sview, we are reverting a
change that would display each node at a separate location even if
they share a common ZXYZ coordinate.

Add squeue support to display a job's license information. Patch by Andy
Roosen (University of Deleware).

If an salloc allocation is revoked and the job is in a suspended state,
send the child processes a SIGCONT before sending SIGHUP or SIGTERM so
that the processes can terminate immediately.

For front-end architectures on which job steps are run (emulated Cray and
BlueGene systems only), fix bug that would free memory still in use.

Processes suspended and resumed are determined by using process group ID
and parent process ID, so some processes may be missed. Since salloc runs
as a normal user, it's ability to identify processes associated with a job
is limited.

Only suspend the salloc command's children when suspending the job for cray systems.
This is required to prevent additional aprun commands from being spawned.

Modify srun_job_suspend() to return status (message sent or not)

Modify slurmctld logic to send SRUN_REQUEST_SUSPEND so that it does not wait
for a reply from salloc or srun.

This initializes the job_suspend callback function in srun.

Improve efficiency of select/linear plugin with topology/tree plugin
configured, Patch by Andriy Grytsenko (Massive Solutions Limited).

Modify smap and sview to display all nodes even if multiple
nodes exist at each coordinate.

Modify NODES_PER_COORDINATE as desired in
src/plugins/select/cray/libemulate/alps_emulate.c b/src/plugins/select/cray/libemulate/alps_emulate.c

this is a resubmission of https://github.com/chaos/slurm/pull/24