No changes to logic

Coverity CID 44779

This should be redundant
Coverity CID 45168

Coverity CID 45168

Uninitialized fd value meant the open was skipped
after commit aacd6b65.

Otherwise the job step could have already ended and the WAKE RPC
  could be rejected with some misleading communication error
  being send to srun

Don't flag a job as "SPAWNED" for debugger until all process
  information is available for all pack job components.

Previous code could exit srun before all I/O was processed.

Coverity CID 44695

Coverity CID 171475

Coverity CID 171464

Coverity CID 44842

Coverity CID 44760

Coverity CID 171456

Coverity CID 44846

Swap banking and TRES talks, Change "SLURM" to "Slurm"

Adding a newline prevents this error:
conftest.c:154:8: error: if statement has empty body [-Werror,-Wempty-body]

remote cluster correctly determine the select type.

Bug 2329

Modify "srun --mpi=list" output to match valid option input by removing the
    "mpi/" prefix on each line of output.

Enable them onlyh with SchedulerParameters=enable_hetero_jobs OR
  MPI type is "none"

Do pointer comparisons rather than strcmps.
~80x speedup
Bug 3529

e.g.
1000 nodes
8000 tasks
[Sep 11 14:24:15.873639 20992 srvcn        0x7f8c1cdda700] _task_layout_hostfile: hostfile processing took usec=2152678 (orig)
[Sep 11 14:27:46.173424 20992 srvcn        0x7f8c1c6d3700] _task_layout_hostfile: hostfile processing took usec=2142997 (orig)
[Sep 11 14:32:32.245420  4037 srvcn        0x7f12de4e4700] _task_layout_hostfile: hostfile processing took usec=26198 (node ptrs)
[Sep 11 14:36:12.88769   4037 srvcn        0x7f12de6e6700] _task_layout_hostfile: hostfile processing took usec=25515 (node ptrs)
[Sep 11 14:41:38.339162  4037 srvcn        0x7f132c8d5700] _task_layout_hostfile: hostfile processing took usec=27459 (node ptrs)
[Sep 11 15:16:59.575189  1874 srvcn        0x7f3dae3f0700] _task_layout_hostfile: hostfile processing took usec=30129 (node ptrs)
[Sep 11 15:20:50.365004  1874 srvcn        0x7f3dc8b34700] _task_layout_hostfile: hostfile processing took usec=29884 (node ptrs)

Previous logic was recording each character in each node name as
  a separate job component's host name

Commit 241f31d7 resulted in
      heterogeneous jobs not building a valid script unless some
      valid burst buffer plugin was configured (no burst buffer
      plugin resulting in NULL batch script).

After auditing the four calls using this function, it's clear that none
of these fd's are ever meant to leak to a fork()'d process.

Created by VIM if .swp is already in use.