consistency between the commands.

Convert socket/core/thread info from uint32_t to uint16_t to save some space.

slurmctld yet, but in opt.[ch].

some of the scancel uses lacked "--quiet", which causes a 
failure if the job is already completed. cancel_job also adds 
"wait_for_job DONE" logic.

or env var.

message was raised and the duplicate options were ignored.  Now SLURM
uses the last instance that it sees of any given option.