Harmonize arbitrary net tester output
Harmonize arbitrary net tester output

The read-from-file version of lwtnn-test-arbitrary-net didn't give a
very useful output for comparing to the non-read-from-file version, or
the new Keras based version. This commit fixes that.

jwsmithers/lwtnn,lwtnn/lwtnn,jwsmithers/lwtnn,jwsmithers/lwtnn,lwtnn/lwtnn,lwtnn/lwtnn