Update default vm rules

[njgheorghita]

What was wrong?

eth-tester was pinned to use the Byzantium vm rules, which are not compatible with newer versions of solidity. Updated to use the Constantinople vm rules by default.

See this issue

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[pipermerriam]

I think there dead code related to forks that can/should be removed.

eth-tester/eth_tester/backends/pyevm/main.py

Lines 263 to 293 in 722a3d3

	FORK_NAME_MAPPING = {
	FORK_HOMESTEAD: 'homestead',
	FORK_TANGERINE_WHISTLE: 'tangerine-whistle',
	FORK_SPURIOUS_DRAGON: 'spurious-dragon',
	FORK_BYZANTIUM: 'byzantium',
	}
	def _mk_fork_configuration_params(fork_config):
	all_block_numbers = tuple(fork_config.values())
	if len(all_block_numbers) != len(set(all_block_numbers)):
	duplicates = tuple(sorted(
	blk_num for blk_num, freq
	in frequencies(all_block_numbers).items()
	if freq > 1
	))
	raise ValueError("Duplicate block numbers: {0}".format(duplicates))
	args = {
	(block_number, FORK_NAME_MAPPING[fork_name])
	for fork_name, block_number
	in fork_config.items()
	if (block_number is not None and fork_name != FORK_DAO)
	}
	if FORK_DAO in fork_config:
	kwargs = {'dao_start_block': fork_config[FORK_DAO]}
	else:
	kwargs = {}
	return args, kwargs

eth-tester/eth_tester/main.py

Lines 64 to 67 in 1d13750

	@to_dict
	def get_default_fork_blocks(supported_forks):
	for fork_name in supported_forks:
	yield (fork_name, None)

eth-tester/eth_tester/backends/pyevm/main.py

Lines 91 to 97 in 1d13750

	SUPPORTED_FORKS = {
	FORK_HOMESTEAD,
	FORK_DAO,
	FORK_SPURIOUS_DRAGON,
	FORK_TANGERINE_WHISTLE,
	FORK_BYZANTIUM,
	}