Spack packages needing updates/testing after Spack 1.0 support

[pearce8]

• commbench Adding support for Commbench as a new experiment, also adding El Dorado as a system #1042
• mpi-pingpong [WIP] Mpi-Pingpong Benchmark #726
• sparta SNL sparta  #1033
• babelstream Babelstream #910
• branson features/branson #462
• gromacs Features/gromacs #835