Add support for using python3 in new verison of VTK. (#11673)
Add support for using python3 in new verison of VTK. (#11673)

* Add support for python3 in new versions of VTK.

iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack