burst_buffer/cray: Accept new jobs on backup slurmctld daemon without access
    to dw_wlm_cli command. No burst buffer actions will take place. Newly
    submitted jobs will be accepted and stay in pending state. Jobs depedent
    upon stage-in or stage-out will remain in their current state until the
    action can take place.

This commit fixes a bug in the multi-prog handling. When running
salloc -N 2 srun -O --multi-prog mp.conf where mp.conf reads

0-192 true

srun crashes can be observed. valgrind reports:

==6857== Invalid read of size 4
==6857==    at 0x45938D: bit_realloc (bitstring.c:189)
==6857==    by 0x5977A9: _update_task_mask (multi_prog.c:335)
==6857==    by 0x597A5E: _validate_ranks (multi_prog.c:403)
==6857==    by 0x597D1E: verify_multi_name (multi_prog.c:469)
==6857==    by 0x6E7B4BE: launch_p_handle_multi_prog_verify (launch_slurm.c:453)
==6857==    by 0x58A25D: launch_g_handle_multi_prog_verify (launch.c:493)
==6857==    by 0x58E556: _opt_args (opt.c:1927)
==6857==    by 0x58A3B9: initialize_and_process_args (opt.c:270)
==6857==    by 0x591F82: init_srun (srun_job.c:459)
==6857==    by 0x427E70: srun (srun.c:193)
==6857==    by 0x428E23: main (srun.wrapper.c:17)
==6857==  Address 0x5ace440 is 16 bytes inside a block of size 28 free'd
==6857==    at 0x4C2BB4A: realloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==6857==    by 0x446886: slurm_xrealloc (xmalloc.c:139)
==6857==    by 0x45944C: bit_realloc (bitstring.c:191)
==6857==    by 0x5977A9: _update_task_mask (multi_prog.c:335)
==6857==    by 0x597A5E: _validate_ranks (multi_prog.c:403)
==6857==    by 0x597D1E: verify_multi_name (multi_prog.c:469)
==6857==    by 0x6E7B4BE: launch_p_handle_multi_prog_verify (launch_slurm.c:453)
==6857==    by 0x58A25D: launch_g_handle_multi_prog_verify (launch.c:493)
==6857==    by 0x58E556: _opt_args (opt.c:1927)
==6857==    by 0x58A3B9: initialize_and_process_args (opt.c:270)
==6857==    by 0x591F82: init_srun (srun_job.c:459)
==6857==    by 0x427E70: srun (srun.c:193)

Do not process SALLOC_HINT, SBATCH_HINT or SLURM_HINT environment variables
    if any of the following salloc, sbatch or srun command line options are
    specified: -B, --cpu_bind, --hint, --ntasks-per-core, or --threads-per-core.bug 3118

Without this change, only the error was available, but no identification
  of the specific plugin that failed.

Coverity was complaining that the return value of s_p_get_* was
ignored. I added typecasting of the return value to (void) where
needed. No change in logic, just making Coverity happy ;)

_select_nodes_parts() was resetting state_reason to an admin hold
without regard to admin vs user hold state. state_reason is the only
place that user vs. admin is distinguished, so this prevented users
from releasing these jobs.

Bug introduced by commit fb46c84b in 16.05.5.

Bug 3197.

This is an addition to commit cb7ed937

Related to commit 974878cd

The kmem limit was added in commit 084c9308

bug 3191

bug 3192

Continuation of commit 2fd4d7a6. MySQL dropped support for 'ignore',
unconditionally remove that to avoid issues with mismatching client + server
versions like in bug 3189.

Improve reported estimates of start and end times for pending jobs.
bug 3184

Cray: Prevent abort in backfill scheduling logic for requeued job that has
    been cancelled while NHC is running.
bug 3185

Old command line would not work with FreeBSD. New command line
  should work with all systems
bug 3021

Add mechanism to constrain kernel memory allocation using cgroups. New
    cgroup.conf parameters added: ConstrainKmemSpace, MaxKmemPercent, and
    MinKmemSpace.
bug 2917

Also replace string copies with setting of pointers for better
performance.

Modify DataWarb example to use an environment variable rather than absolute path

older versions.  This is fixed differently going forward, so we can
start warning about deprecated declarations again.

the way we use it and it also is deprecated, most likely since it
really isn't needed.

new glibc 2.24+ that depricates readdir_r.

Bug reported by Coverity