Test previously failed with heterogeous nodes (i.e. different
core counts on different nodes).
bug 2597

We know it is in 1.7.1 but not in 1.3.0

tree_msg_to_stepds() which does the same thing.

nodes not able to contact.

Bug 2431

This reverts commit 2243bf33.

Conflicts:
	src/plugins/burst_buffer/cray/burst_buffer_cray.c
	src/plugins/select/cons_res/select_cons_res.c

The gprof tool is showing most time is being consumed by the bit_test()
  function as called from the select plugin, which in turn was called
  by the backfill scheduler. These changes replace the for loop end-points.
  Previous logic tested for all possible nodes. The new logic identifes
  the first and last bit set in the node bitmap and uses those end-points
  instead. Node the logic to find the first and last bits set starts off
  with a word-based search (testing for a 64-bit zero value rather than
  testing each individual bit). The net result is a small performance
  improvement.
bug 2588

Bug 2622.

Bug 2622.

burst_buffer/cray - Decrement job's prolog_running counter if pre_run fails.
bug 2621

If a job is no longer in configuring state, then clear the prolog_running
  counter on slurmctld restart or reconfigure.
bug 2621

For case where job can't start and there are no running jobs
to remove in order to establish estimated start time.

When determining when a pending job will be able to start, rather
  than testing after removing each running job and trying to schedule
  the pending jobs, remove multiple jobs that all end about the
  same time before testing. This reduces the number of calls to
  the job placement logic, which is time consuming.

list_peek_next(), like list_next() but WITHOUT advancing the pointer

work correctly when --with-<package> where no input was given.

Document and log cases where max jobs per user or partition is
  equal or greater than the max jobs test. In that case, a single
  user can easily stop all backfill scheduling.

doing a ntasks_per_core=1