Without this change, one of the two job steps could consume all
  memory and delay the second step.

Conflicts:
	configure

This also corrects per user burst buffer space calculation

_calc_billable_tres that was missed there.

requests no time limit.

http://bugs.schedmd.com/show_bug.cgi?id=2177

Conflicts:
	src/plugins/jobcomp/elasticsearch/jobcomp_elasticsearch.c

Avoid logging every time that some interaction with the elasticsearch
server happens. That would generate too many log messages.
Fix allignment problem in the code without changing logic.

Added a limit of MAX_JOBS 100000 jobs enqueued and waiting to be indexed

When slurmctld is reconfigured, it makes sure that every pending
batch job has a script and if not mark the job as failed. If the
script is present with no job, then purge the file/directory.

This re-write of the logic takes advantage of hash tables to
improve the performance of the algorithm and is an improvement
on the logic in commit 862f3c8e
and will work with the version 15.08 code base as well
Time for for slurmctld reconfig with 110,000 jobs/files
37.8 sec with original code
2.2  sec with commit 862f3c8e
0.8  sec with latest code
bug 2220

Usernames are comma separated, not colon delimited. Bug #2222.
While here fix a few spelling mistakes.

Fixed a typo that was causing slurm_cred_copy to segfault

This adds some job memory limits to avoid tests failing with a
configuration having SelectTypeParameters=CR_Memory and NO
default memory size.

Conflicts:
	src/plugins/jobcomp/elasticsearch/jobcomp_elasticsearch.c

If a job is configured to be sent a signal when approaching its
timeout and the job is requeued after the signal is sent, then
resend the signal at the approriate time after requeue.
bug 1415

If the backfill scheduler can not start at the appointed time, say
because there are too many pending RPC, then only sleep 1 second
and try again rather than the full bf_interval (30 seconds by default).