Fix for vtkIOParallelXMLPython-MPI-testParallelMultiBlockWriter test.
It seems like a barrier is needed between when the test files are deleted and when they're created after that such that the new files are created after the old files are deleted.
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It seems like a barrier is needed between when the test files are deleted and when they're created after that such that the new files are created after the old files are deleted.