- fixes to help ensure slurmd uses the same key for shared memory
     on a restart (to avoid losing track of jobs)
   - slurmd only runs one launch thread at a time
   - fix bug in slurmd where multiple threads used same address space
     for connecting client address.
   - srun always sends SIGKILL to job step before issuing complete request
   - Changed short string for draining nodes to drng from drain.
   - srun default launch message timeout increased to 5s.