Add a nodelist option to the slurm launcher
Add a nodelist option to the slurm launcher

Allow a nodelist to be specified for the slurm launcher. This can either be set
by passing the executable a --nodelist or by setting the env var
CHPL_LAUNCHER_NODELIST

CoryMcCartan/chapel,CoryMcCartan/chapel,hildeth/chapel,CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,chizarlicious/chapel,hildeth/chapel,hildeth/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,chizarlicious/chapel,chizarlicious/chapel