mvapich2 : added variants for different network types
mvapich2 : added variants for different network types

EmreAtes/spack,iulian787/spack,krafczyk/spack,matthiasdiener/spack,LLNL/spack,TheTimmy/spack,LLNL/spack,TheTimmy/spack,lgarren/spack,iulian787/spack,mfherbst/spack,iulian787/spack,matthiasdiener/spack,lgarren/spack,skosukhin/spack,mfherbst/spack,LLNL/spack,EmreAtes/spack,TheTimmy/spack,lgarren/spack,matthiasdiener/spack,EmreAtes/spack,tmerrick1/spack,lgarren/spack,krafczyk/spack,matthiasdiener/spack,mfherbst/spack,mfherbst/spack,tmerrick1/spack,skosukhin/spack,krafczyk/spack,skosukhin/spack,matthiasdiener/spack,lgarren/spack,krafczyk/spack,LLNL/spack,krafczyk/spack,iulian787/spack,iulian787/spack,TheTimmy/spack,tmerrick1/spack,mfherbst/spack,skosukhin/spack,LLNL/spack,tmerrick1/spack,tmerrick1/spack,EmreAtes/spack,skosukhin/spack,EmreAtes/spack,TheTimmy/spack