adding time limits to slurm commands in SLURM.pm and SLURMmod.pm

I am running ARC CE 6.7.0 with SLURM and ARC CE stops reporting job status once a week due to SLURM commands like /usr/bin/sinfo -a -h -o cpuinfo=%C sometimes blocking indefinitely.

I see that SLURM.pm and SLURMmod.pm are running SLURM commands using open(SCPIPE,"...|") without any time limit.

I think that it would be better to run external commands using IPC::Run with time limits.