vtkhdf: setup polydata testing

IO/HDF/Testing/CMakeLists.txt

IO/HDF/Testing/Cxx/TestHDFReader.cxx

IO/HDF/Testing/Cxx/TestHDFReaderTransient.cxx

Testing/Data/hdf_poly_data_twin.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_000.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_001.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_002.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_003.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_004.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_005.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_006.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_007.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_008.vtp.sha512

...oly_data_twin/hdf_transient_poly_data_twin_009.vtp.sha512

Testing/Data/test_poly_data.hdf.sha512

Testing/Data/test_transient_poly_data.hdf.sha512