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.

  and TIME_STR) from slurmctld/proc_req.[ch] to common/timers.[ch]
  for ease of use elsewhere.

* REQUEST_SUSPEND because it can result in problems for gang scheduler
* REQUEST_TERMINATE_JOB because slurmctld's re_kill_job() resends as needed