Is there a better way to reprogram_tag

[Christian-B]

I was looking at why IPtagResource, LivePacketGatherParameters and sim.external_devices.activate_live_output_for have a "tag" parameter.

Turns out it is so the number matches the the number given to
from spinnman.utilities.utility_functions import reprogram_tag

Used in
spinn_gym/games/breakout/visualiser/visualiser.py
and
spynnaker_integration_tests/test_external_devices/test_live_spike_translator.py

Discussing with @rowleya he things it was a hack.