test: Replace fragile "rng" with call to random()
test: Replace fragile "rng" with call to random()

Former-commit-id: 616a7132a39a0523e91511bdc904344a8489809f
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin