tjn: setup build env on summitdev for "vanilla" omp case

[naughtont3]

Setup the build environment on Summitdev for the "vanilla" OMP (no modifications to OpenMP) case. This will require OpenMPI (libevent, pmix, ompi) and MOC (ompi, pmix) and a proper LLVM/Clang.

Note: Install into stf010 area.

• libevent
• pmix
• ompi
• moc (branch: tjn-myrank-place-vanilla)
• llvm/clang (module load? or from source, see scripts)