Tensorflow model loading/saving seems bugged

[blester125]

The tests that saving and load tensorflow models have errors. The initial error is that the file names need to end with .weights.h5. When that is done (adding suffix=".weights.h5" to the NamedTemporaryFile calls) it still has errors about the format not being expected (not an SSTable, bad magic number).

So the way we save/load models might need to be re-done, or at least the way we are testing them. This needs to be investigated further.