Adding message passing header to the C++ driver test.
Adding message passing header to the C++ driver test.

paulromano/openmc,amandalund/openmc,amandalund/openmc,paulromano/openmc,shikhar413/openmc,amandalund/openmc,mit-crpg/openmc,shikhar413/openmc,mit-crpg/openmc,walshjon/openmc,paulromano/openmc,walshjon/openmc,shikhar413/openmc,mit-crpg/openmc,paulromano/openmc,walshjon/openmc,shikhar413/openmc,walshjon/openmc,amandalund/openmc,mit-crpg/openmc