Add pmiX functionality
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Add new pmiX functionality to current slurm, So future compiled MPI programs will run on openmpi-3.1.4-pmix with pmix
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ensure pmi and pmi2 are available for existing MPI programs, So existing MPI programs will still run on openmpi-1.10.7-mlx and openmpi-3.1.4-mlx
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Add a sym-link to current slurm with /opt/slurm-latest