mpi4py: use the output, not the result
mpi4py: use the output, not the result

Change-Id: Ia996924cb07e8197724d583c2c5e8906a6cf37d8

hendradarwin/VTK,sumedhasingla/VTK,gram526/VTK,johnkit/vtk-dev,berendkleinhaneveld/VTK,mspark93/VTK,gram526/VTK,sankhesh/VTK,candy7393/VTK,gram526/VTK,jmerkow/VTK,demarle/VTK,hendradarwin/VTK,ashray/VTK-EVM,gram526/VTK,keithroe/vtkoptix,candy7393/VTK,ashray/VTK-EVM,msmolens/VTK,mspark93/VTK,ashray/VTK-EVM,johnkit/vtk-dev,mspark93/VTK,msmolens/VTK,sankhesh/VTK,msmolens/VTK,msmolens/VTK,msmolens/VTK,demarle/VTK,keithroe/vtkoptix,sankhesh/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,jmerkow/VTK,keithroe/vtkoptix,keithroe/vtkoptix,sumedhasingla/VTK,sumedhasingla/VTK,keithroe/vtkoptix,sankhesh/VTK,SimVascular/VTK,demarle/VTK,demarle/VTK,msmolens/VTK,demarle/VTK,msmolens/VTK,gram526/VTK,jmerkow/VTK,hendradarwin/VTK,sankhesh/VTK,johnkit/vtk-dev,demarle/VTK,hendradarwin/VTK,candy7393/VTK,keithroe/vtkoptix,keithroe/vtkoptix,gram526/VTK,SimVascular/VTK,ashray/VTK-EVM,SimVascular/VTK,keithroe/vtkoptix,msmolens/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,johnkit/vtk-dev,sumedhasingla/VTK,gram526/VTK,SimVascular/VTK,mspark93/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,hendradarwin/VTK,gram526/VTK,ashray/VTK-EVM,candy7393/VTK,jmerkow/VTK,SimVascular/VTK,candy7393/VTK,sankhesh/VTK,SimVascular/VTK,candy7393/VTK,mspark93/VTK,SimVascular/VTK,jmerkow/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,ashray/VTK-EVM,candy7393/VTK,mspark93/VTK,johnkit/vtk-dev,johnkit/vtk-dev,jmerkow/VTK,berendkleinhaneveld/VTK,candy7393/VTK,jmerkow/VTK,demarle/VTK,berendkleinhaneveld/VTK,mspark93/VTK,ashray/VTK-EVM,jmerkow/VTK,demarle/VTK,mspark93/VTK,hendradarwin/VTK,ashray/VTK-EVM,hendradarwin/VTK,sumedhasingla/VTK