test: use independent IO in h5u_test_{read,write}3() for hdf5 > 1.8.12
Since MPI-POSIX VFD has been removed from hdf5 > 1.8.12, but a test with stride data should be performed, we use independent IO instead for hdf5 > 1.8.12
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Since MPI-POSIX VFD has been removed from hdf5 > 1.8.12, but a test with stride data should be performed, we use independent IO instead for hdf5 > 1.8.12