Fix ParaView CMake rules for VTK Python module

Make sure VTK properly finessed to filled its Python vtk
module before copying it into the paraview Python destination.

Change-Id: I44fa5ef93b65361816032263d7f6061c4ed70dcb
Merge topic 'fix-python-cmake-rules' into next

bf759ca Fix ParaView CMake rules for VTK Python module