In srun, if only some steps are allocated and one step allocation fails,
 then delete all allocated steps.

Set SLURM_NTASKS environment variable to reflect global task count
(needed by MPI).

Set SLURM_PROCID environment variable to reflect global task rank
(needed by MPI).

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Hoping this clears warning
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Fix typo
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bug 3217

Coverity CID 44815

If srun lacks application specification for some component, the next one
      specified will be used for earlier components.

This insures that the batch script can have appropriate environment
  variables set for all components (i.e. the node list, cpu count,
  etc. for all pack groups).

Previous logic was not properly setting env vars for pack jobs. In
  some cases the env vars were being set in slurmctld and NOT only
  if the parameter was set on sbatch command line.

When the "scontrol update jobid=#" command specifies a pack job
leader, then modify all components of the pack job. To modiify only
the pack job leader, specify "scontrol update jobid=#+0".

This reverts commit 00a691b9.