Merge pull request #46 from adammoody/slurm-2.3.3.chaos

add munge to mvapich plugin
Modify the mpi/mvapich plugin to use MUNGE

New mpi/mvapich plugin is 9
slurm-2.3.3-1.17chaos
Move mvapich changes to SLURM 2.3.3-1.17chaos heading
Updates for slurm-2.3.3-1.18chaos