[cpm] Removed MPI dependencies in vtk.

Lars Bilkerequested to merge
bilke/ogs:fix-petsc into master

For writing output with PETSc we just use the vtkXMLPUnstructuredGridWriter which has no dependency on MPI and we therefore don't need the vtkMPIController.

Fixes #3289 (closed).

  1. Feature description was added to the changelog
Edited by Lars Bilke

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