This also had to change the default seed, since with the previous one it
actually got into a state where there were no validators left bonded, lol.
This also changes Unbond msgs from failing with almost 100% probability to now
only failing with 33% probability.
Thus more of the state machine is getting tested!
This removes privkeys and addresses from function signatures.
This comes with a 11% performance improvement to the simulator,
as we no longer keep recomputing the pubkeys.
Once we move the transient store clearing to endblock, we can
further raise the size of make test_sim_gaia_fast
concretely, `make test_sim_gaia_fast` went from 16.8 seconds to 13.5 seconds on my system.