Set testing requirement h5py<3.0.0 (#1638)
Set testing requirement h5py<3.0.0 (#1638)

`h5py` v3.1.0 fixed a bug on the model save codepath, but model loading still fails on the TensorFlow side.
mitdbg/modeldb,mitdbg/modeldb,mitdbg/modeldb,mitdbg/modeldb,mitdbg/modeldb