Bug#1008966: libopenmpi-dev: IO (and UCX) problems causing mpi4py test failures

[Drew Parsons]

dalcini from mpi4py and ggouaillardet from openmpi both raised the same 
question in their respective upstream issues:  why is our MCA io running 
through   romio321 instead of the default "native" ompio?  Sounds like 
it might be the key to multiple problems.

Drew