* mv deploy/tests/test_amis{_snake,}.json
_snake is related to the janky way I manually created MOTO_AMIS_PATH the first time
I'm replacing that with a customized version of the moto/scripts/get_amis.py script
* add scripts/update_test_amis.py as copied from moto
just so that the diff is inspectable later...
* Customize scripts/update_test_amis.py for FireSim
And use it to update deploy/tests/test_amis.json
And add a test to check whether test_amis.json needs to be updated
And make all of the tests that will fail confusingly depend on that test
* add comment about running script when you update the AMI
Co-authored-by: Tim Snyder <snyder.tim@gmail.com>