Fix update node RPC to handle reason field change without state change.
  State was being handled as type int instead of uint16_t so NO_VAL check
  was not working properly.

"Scontrol abort" works. It was leaving a hung pthread due to a recent
   change.
Fix a couple of potential memory leaks
"switch_type" has been added to config data structure, un/pack, etc,
   but not yet reported to the user or documented yet.
The plugins now use function calls to get a their type and plugin directory
   from a common data structure rather than individually reading and
   parsing the configuration file.

line for greater clarity.

  (as well as the reverse) in all qsw code.

 - move elanhosts.[ch] to common
 - initialize elanhost_config on demand in qsw.c
 - remove calls to elanhosts in slurmd/elan_interconnect.c
 - merge libhostlist into libcommon since elanhosts needs it.

completion plugin.

 o set exit code to 1 if any tasks failed

   to srun or slurmctld.
 o new errno ESLURMD_UID_NOT_FOUND

functions, but only for a single task. Multi-task support will need to
wait for modifications to srun and its communications protocol.

sharing via node record of job count (0 | 1) and bitmap of nodes which
permit sharing. Previous logic could permit a job accepting shared nodes
to be scheduled on a node that already had a running job not accepting
shared nodes.

Just log open failure and continue.

failure as fatal error.

failure, log with fatal() and exit.

exit rather than log with error() and continue (which causes abnormal behavior).