sysutils/spcm: Update to 0.5.4

Remove slurm-shutdown-idle-nodes, deprecated by cluster-power-saver
Merge slurm-memory-use into slurm-cluster-load
cluster-power-manager: New menu for IPMI power on and shut down
slurm-restart: Work around service munged restart failures on FreeBSD
Leverage improvements in auto-admin 0.7.1
Several other minor fixes and enhancements