Switch generate_fsm_test.sh to Python 3
Switch generate_fsm_test.sh to Python 3

Switch the non-default Python versions to Python 3 too, using Python 3.5
as minimum version (older Python 3 versions are already EOL).

OlafvdSpek/ctemplate,OlafvdSpek/ctemplate,OlafvdSpek/ctemplate,OlafvdSpek/ctemplate,OlafvdSpek/ctemplate,OlafvdSpek/ctemplate